Cyberflight 1.5 adds some internal improvements that should prevent problems when you "deruth" inside a large building (it's still not advisable, mind you) and finally stakes the 'endless rising' problem in the heart... albeit by brute force anchoring you in place after you've been hovering for a few seconds.
I've tried to avoid this solution in favor of improving the feedback loops, since of course you can't use an anchor in level flight, but alas tuning and retuning it to adjust to sim performance differences has failed to do the job, so I've given in to popular pressure and used an anchor. This is NOT a "security anchor", it uses a long time factor to keep from jerking you about and only activates when it needs to to stabilize you when you're hovering.
If you prefer to let the feedback loops work, the new "Drift" / "Anchor" toggle in the dialog will let you turn it off.
Cyberflight 1.5 is available in the Coonspiracy Stores, my main store in Lostfurest dAlliez, and of course various stalls around the place. Check my picks for landmarks.
And of course it's still open source. Please feel free to send me any improvements you make.