Well, I'm pinching myself; went through almost half the main quest without a crash/blockage, so I'll post what I have so far. 'Quick-testing' (using 'COC' and so forth) was done fairly completely for Synda, less so for Johnny.
- commented-out 'PositionCell' statements in some scripts which seems to have resulted in more stability re: Vladir's Crypt, travel to Amanda's from Vos, perhaps travel past the spikes as well
- for whatever reason, spiders in Balmora sewer have not crashed for me lately
- code added to SCUGLadder (A1ladder) which prevents ladder movement until ordinators are dead
- journal update created for retrieval of Quixoquinet amulet
- for whatever reason, I get no 'jitter dance' from Synda/Johnny in The Underground any more
- added dialogue entry which allows Johnny to advance past Prudance's guard (when Johnny not near)
- other fixes, most pertaining to journal updates
- minor dialogue changes
http://www.mediafire.com/download.php?ot3mkju4wtt
I would appreciate anybody else trying this partial fix to see how it works for you.
(More in included 'ReadMe')