Great mod! A few QoL suggestions:

No Lua scripting knowledge required:
1) Snap points on the main board (and the big dungeon boards) for easier placement of cards (and tiles for big dungeon boards)
2) A dedicated "discard" bag for used up cards. Possibly separate bag for discarded equipment, since the latter is frequently searchable from card effects
3) Move the column of tiles to the top of the table or somewhere else so they don't get in the way when switching to a big board.
4) Put the column of tiles into their own bags rather than a big stack
5) Some +1 attack modifier tiles to use as a reminder when facing multiple enemies at once
6) Have "Layout" boxes for each of the inventory slots (weapons, equipment, etc.) so that the cards will naturally fan out and stay organized dswhen placed so you can see them all
7) Add Names to stuff - ideally everything, but at a minimum the different starting decks so you can quickly confirm at a glance what each one is just by hovering and reading its name (e.g. Red Tomb Cards, etc.) The specialty deck would also be particularly useful so you can search by typing the card you want.

Some things that will require a bit of scripting knowledge (without going full scripted version):
1) Remove the "text input" on the health/luck/xp/etc. trackers and replace them with button labels. As it is now, you have to carefully click around the number to change its value
2) Add monster health button functionality to the face side of each monster card, so you don't have to move around those health trackers
3) have the game shuffle all decks on load so you don't have to remember to shuffle each monster deck/room deck/etc. each time.

There's obviously a ton one could do to fully script things (starting load-outs for characters, auto-combine decks for dungeon vs. tomb, auto-clear gem markers from map tile when completing a level, automate attacks and skill checks, etc.) but I understand you'd need some real experience scripting ... and time.

Let me know if you wanted help with any of that. I can do some modest scripting.