I haven't updated past 1.04 and wanted to even do a clean install of 1.03 as I recall there were less NPC pop-in there. But I guess mod support wasn't implemented until 1.08, am I right or am I wrong?
Yep Mod support was like 1.08.1 or something like that, you can't use mods unless you update to that version of the game.
Regardless, the whole NPC Pop-In patch degradation thing is grossly over-exaggerated. As in, it has always been bad, and if later patches have indeed made it worse (Which I've tried 1.02 vs 1.04 vs 1.06 vs 1.08 and it was exactly the same each time), it's not insanely worse like some people make out. Merely slightly more terrible than the already bad state it was in.
As for the mod, I've observed a few little issues (Instant, jarring scene lighting changes & after the game switched to rain/foggy condition it never went back to being sunny/clear, no matter how many times I meditated), but they're small concessions, things I can live with, to enjoy the glorious lighting and beautifully clean draw distance which lends itself so nicely with all the great vistas in TW3.
Cheers for the hard work you guys put into the mod, and maybe if we see the modding tools get expanded/updated, some of those little issues can be easily ironed out. Even if they don't, as it is is still greatly appreciated.