A couple days ago, I did a clean reinstall of BG2 and added about thirty mods, including the Banter Pack and Item Upgrade mod. (What can I say, I like variety.
) Needless to say, I don't remember the exact install order, but I definitely remember installing the Banter Pack a few mods before the Item Upgrade mod. When I tried to talk to Cromwell about the standard Bioware upgrades (i.e., "tell me what I have that can be combined"), I got a windowful of lines about asking Valygar a question, teaching rock-paper-scissors to Boo and several other comments which presumably came from the Banter Pack instead. When I did
another clean reinstall and this time added the Item Upgrade mod, then the Flirt Pack and
then the Banter Pack (and then the twenty-five other mods, minus three that didn't work/were a joke/were too cheesy), that particular conversation worked like it was supposed to again.