Hi! So, I guess the answer is, yes and no. Right now there isn't a way to eg drop mods in, enable/disable them in the game, that sort of thing. I don't know if I'll ever go that way, unless the game takes off in a way that it hasn't so far. But, if you're just looking to change stuff - add creatures, spells, items, maps, etc, there's absolutely support for that. All the text is externalized. Creature behaviours, custom map code, etc, are all handled by Lua scripts which can be edited. Map data is all contained in XML files. There's a lot of opportunity to hack at stuff, even if eg you'd want to do so in a separate copy of the game.
What kind of support are you looking for?