There are a couple impediments to properly porting over some legacy mods, as well as hindering future ones. At the risk of sounding ignorant, I'll just dump the requests:
1) Refactor Area Checks to 2DA(s)
Right now, it is impractical to implement mods like unrestricted use of DUSTROBE.itm, being restricted in-code to AR0201/2/3. Moreover, these needlessly hardcoded checks limit the flexibility of the advertised moddability.
2) Refactor list of Bestiary Entry References/Triggers to moddable file.
Not really sure how this would be accomplished, but exposing this would allow modders to add new characters and content with corresponding bestiary entries.
If either of these are infeasible, that's fine - but please let me know.