Are there so few PST mods because modding it is harder?

Hello all, I noticed that PST:EE has way fewer mods and almost none that added content (characters, quests, whatever) compared to the Baldur's Gate games. Is it because it is significantly harder to mod PST (or at least was before the EE) or is it just that BG2 had a lot more fans and developed a much larger modding community? I don't plan on getting distracted from the BG2 mod that Ratatoskr and myself are working on until it's finished, but PST is one of my favorite games, it would be cool to mod it. Also has anyone tried porting PST characters into Baldur's Gate? Thanks.