As said, I proposed a model for universal suffrage of SC members while still maintaining the notion of "tenure" that Calli so well explained. And it also allows the RA to put forward nominations. But it completely removes the RA from the "approval" process.
To recap (my long-winded posts sometimes get confusing):
SC announces vacancy (for whatever reason)
Nominations for candidates are accepted:
From the SC;
From the RA;
From any group of 5 citizens.
Candidates are validated by the SC (through a majority vote of SC Chairs) as to their qualifications (i.e. known merit in discussing complex legal/constitutional issues, knowledge about the workings of the CDS and its history, and so forth — just as we have today).
Eligible candidates are put to a yes/no vote via universal suffrage (could be also done during General Elections, or, in case of need, using the mechanism for by-elections).
Candidates with a "yes" vote become new Professors at the SC as soon as the results are in.
This method:
Preserves the SC's prerogative of selecting which candidates are appropriate or not;
Allows the RA (or any group of 5 citizens) to nominate whomever they wish as candidates to the SC;
Allows the RA — or anyone else, really — to publicly campaign for or against any SC candidates, organise public debates, etc. just like we have for the RA itself and/or the Chancellor;
Allows the whole population to select which of the eligible candidates are allowed to serve to the SC, one by one.
Note that I'm not entirely happy about having a "popularity contest" for selecting people for their abilities to interpret the law and solve complex constitutional questions, because, as usual, the ones with more charisma will win, no matter if there are more qualified candidates to join the SC. Still, under that suggestion, at least the SC has a chance to weed out the rotten apples, but might afterwards be unable to get the "best" members for the job — just the "most popular" ones, which will weaken the SC in the long run. But, as said, it's a compromise. Far, far better than having the RA selecting whatever members they wish to, in order to make sure they can "control" the SC and curb their power to remain independent (as much as possible).
I'm happy to discuss why that suggestion is not good
Pat, I know that you suggested that the RA would only select the SC members once, and so, on subsequent terms, it would matter less if a "political Professor" is aligned with the RA or not. IMHO, though, this will hardly be the case: a RA-friendly Professor in one term — who will pretty much approve everything the RA says — will become a RA-hating Professor on the next term — who might just disapprove everything on a whim because "their friends" are not currently "in power" and stall legislation until "their friends" can get elected again. We have seen this happening even under the current system! And this is just the pragmatic view... I'm not even talking about the "abomination" of having a branch selecting the members of another branch which is supposed to keep the first branch in check. That's really asking for trouble! Or, well, just asking for having an "unbounded" RA that can pretty much do whatever they please at will, even revoke the Constitution or at least change it so that nobody gets elected for the next decade or two...
And we know that RA members do try to subvert the Constitution, all the time. It's not just a hypothetical issue. We also know that an "absent SC" will allow the Constitution to be changed beyond recognition and it will take years until some semblance of democracy, checks and balances are restored, just because the SC sometimes fails to meet in a reasonable timeframe. So we know this to be the case. Getting the SC full with "RA buddies" will just make it much worse and destroy pretty much any chance of getting back to "normalcy" again.
So if your personal peeve is that "nobody elects" the SC members and thus we're not "democratic" — take a look at universities; they have a long track record of being fairly democratic, even when they operated under external political systems allergic to democracy — then the only solution is to have all the citizens approve them...
I'm very reluctant to say so, but I might find it tolerable to allow the SC nominate members and have the RA vote on their approval, so long as there is no "cross-examining" and public humiliation, but just a yes/no vote... but I'm going to regret having written this paragraph Because, of course, it would mean that the RA would always reject a highly-qualified candidate just because they disagree with their views. Having them elected by universal suffrage will avoid that issue to a degree — the same justification applies to when we discussed electing the Chancellor by universal suffrage, as the RA tended to over-politicise the Chancellor election and hardly anyone would agree to become a candidate if they knew that the RA's majority was against them.
Oh well...