So importing a savegame into ToB preserves all global variables? AFAIK, you can't go straight from SoA to ToB without having to export-import.
I imported no savegame. I played straight into ToB from Mary Magus' house--MoveToExpansion(). Why would you not be able to play right into ToB? You always could before. If this is a fact, then I smell a serious limitation in the BGT package. One that was introduced with BGT-weidu. One that should be corrected, as this is the antithesis of continuity. I'm pretty sure this is not what you meant. Especially if BGSENDAI is all that stands in the way. It's the only BGT-related error I've seen thus far, and I'm down to only Balthazar left standing in the Five.
For the record, it looks like I missed BGSENDAI in BP-BGT as well. That's because I never managed to get a game this far along.