Here is round two of my various E34 issues that I'd like to go through.

1) I have the infamous seat twist issue on both of my front seats, the driver side has it on the height adjustment, the passenger side has it on the recline. I have read the various guides on repairing the problem, this is more of a cry for motivation. Is it really as simple as:
1. Removing the motor from the chair.
2. Removing the cable from the motor.
3. Heating the metal end with a lighter, and removing it from the cable.
4. Trimming the seat cable a little short of 1/2"
5. Heating the metal end with a lighter, and reinserting it onto the cable.
6. Reversing the entire process.
I keep on wanting to do this, as my seat is far too low, and I can not touch girls in the passenger seat as I'd like to. Just tell me what else I am likely to expect, or some worst case scenarios that are possible, that you may have encountered.

2) My headliner is sagging in the rear, it is not torn or anything, I am curious how difficult it would be to remove it, getting some spray glue, and re-adhering it, considering it is not that bad yet. Is this a simple DIY job or something that may require some special tools/secret Bavarian MacGuyver knowledge?

3) I intermitantly get the Door Open message and chime. I went around the latches on all my doors and clicked them in and out, and they all seemed like they were in operating order. What is the best method to diagnose this issue, and eventually resolve it?

4) I have the US-style low beam lenses, and my left one looks pretty yellow and dull, can I remove the lense and polish it up with something to restore its clarity? Should I just get another lense? Same goes for both my fog lights, which I would like to remove and work with a little, since one of them works, but the other side probably just needs a bulb.

5) My front right turning light doesn't work, however the posistional lights work, are they seperate bulbs, or could it be a more difficult issue?

6) My car constantly complains about the rear left brake light, I go to the back and adjust the socket slightly and it seems to fix it, for a minute (or a pothole, whichever occurs first in NYC) Should I just silicone this into place? Is there any simple way to tighten this up and fix this problem for good?

7) I am installing an aftermarket DIN size radio, there seems to be about a 1cm gap on the left/right, and a minor gap in the height, I am curious where I can purchase a fitting to allow my DIN radio to fit flush.

Thanks again for any help anyone offers with any of these issues, I am growing fond of this car, and these minor problems seem like easy fixes.