I know there were some mods for EA. So as long as modding is possible with full release, I bet the mods will be made pretty quick.
Personally if Larian doesnt add a mode, or options for these in game, (as they should, its the basic rules and lore), Id like the following off the top of my head.
- Racial ability bonuses from the PHB, not this +2/+1 malarkey. The same system thats been in EA for 3 years now.
- Deity choice for Paladins. In Forgotten Realms most Paladins, like clerics, are devoted to a deity, and is the source of their power via their oath.
those are the main ones.
These would also be nice.
- Hide as action for non rogues.
- Loading property for crossbows
- Regular ammunition for Bows and Crossbows.
- Grappling if at all possible.
- Rope and grappling hooks as a tool (its like one of the top utility items, and most used items at that in D&D).
- Other tools like crowbars, bag of ball bearings etc.
- Optional Deity choice for all classes.
