Wanted: Shadows of Amn postgame

So, there are a lot of cool quests and mods for SoA that you don't really need to complete to finish the game, but which are still pretty cool. The thing is, the plot sort of puts some hefty time pressures on you - in Chapter 2, Imoen is captured, and in Chapter 6, Irenicus is besieging the elves. I mean, YES, you CAN just sit around twiddiling your thumbs for a year and nothing will happen, but that sort of strains suspension of disbelief.

It would be really great if killing Irenicus didn't actually end BG2, but let you instead wander around Amn doing sidequests, futzing around in your stronghold and sort of "being retired" (maybe exploring watcher's keep!) until the time came that you felt kind of nervous about your heritage and you decide to go visit the talking heads that start Throne of Bhaal. Also it would give you more time to have fun with the Bhaal tear powers from hell, which personally I think are pretty cool.

Are there any mods that do this? Would it be hard to make one? I've never done any modding on BG before, but I've had some programming experience. Honestly I'd prefer if someone else made it (hurr durr, I want things but do not want to pay for them), or at least helped me. Thoughts? Interest?