Hi!
- Modding is already possible, but there is no official support or integration.
- So far modders have been using an approach which doesn't allow you to use multiple mods at once.
- Many mod makers aren't keeping up with the game updates, so various mods only work on one specific (outdated) version of the game.
- Most of the existing mods focus on making the game easier. Specifically bigger backpacks, more skill points, new characters with overpowered starting gear, things like that. I would say these don't go very well with the punishing roguelike spirit of the game, but to each their own :)
- Devs said that chances of implementing mod support during early access are low to zero, so if it happens, it will be after the game fully releases.