AFAIK, in D&D, writing a spell to a spellbook takes a day and 100 golds per level of the spell(9 days and 900 golds for a level 9 spell). Is there any mod that replicate this behavior? Requiring certain materials to cast magic would be unfeasible, but this I could see being implemented via a mod. I would love to lose 900 golds trying to write down level 9 spell and fail. After all there are too much golds to spend in BG1/BG2.
In addition, are there any more of these kinds of mods that replicate PnP rules and overall makes the game more hardcore(not in cheesy way)&RP friendly, such as making INN fee more expansive?
There seems to be a lot of mods but not many that overhauls the game. I love BG so much that I've been replaying the game many times, and I would love to see some fresh changes.