I've found 2 bugs related to "Choose Party" script. I've also installed the newest MMExtension v2.2 for the script running.
1) What is strange to me, when I started the game with 5 characters, and decided to dismiss temporary one of them to take something from Fredrick Talimere, and I found out that my 5th member didn't show up in the tavern... So, when I dismissed all of them (except 1st) some of them went missing (I don't know what is determining it).
2) Normally at the beginning of the game there is Devlin Arcanus (necromancer) and Elsbeth Lamentia (vampire) at the tavern. Now I found Rohani Oscleton (Elf lvl 5 from Alvar) and another Dark Elf with mixed class (also with a nice "Placeholder text" as a description).
2a) So I started testing:
-) 1 character at the start = Devlin+Elsabeth at tavern
-) 2 characters = only Elsabeth
-) 3 characters = Rohani out of nowhere
-) 4 characters = Rohani + Strange elf-vampire
-) 5 characters = Rohani + Strange elf-vampire
/side note: with 4 starting characters, dismissing some of them also made them vanish/
screenshotsAll in all it's playable but I'm a bit worried about main quests when hireling is needed.
/edit
I've found MM8 Let's play from 2015 with this choose party script/mod, and the tavern was empty (with starting 5 ppl), so what's wrong with the newest version?
Windows 7
MM8 version: GOG eng 1.0 (22833) // MM8 Patch v2.4.1
MMExtension: 2.2
MM8ChooseParty: latest
/edit 2
I didn't give up, so I've managed to find old "MMExtension v2.1" and tested it with the newest MM8ChooseParty script, and it looks like this:
-) 1 character at the start = Devlin+Elsabeth at tavern
-) 2 char - Elsabeth at tavern
-) 3-5 char = no one (so ther's no Rohani + Strange elf-vampire)
Also, what is important, when I dismiss someone he/she is coming back to the tavern and not vanishing.
To sum up: something's wrong with MMExtension v2.2.