Tried creating a whole custom adventurer party in BB, but the game prevented me from doing so saying I've reached the adventurer limit. Either add a possibility to dismiss adventurers permanenly or let me throw out an old one for a new one, but don't tell me I've reached some artificial limit with the party I'm not setisfied.

In my understanding adventure limit was added to prevent player create unlimited number custom companions to replace dead companions. So now you can only create 8 custom companions.

That seems a little shortsighted.  99% of players won't care since they'll reload after death anyway, but anyone who plays with permadeath will just gradually run out of characters.

temporary workabout:

 

if you perma kill BB characters you can recruit full custom party.