I know that morrowind offered a lot of extra goodies in mods for thieving both directly and oppurtunistically

is there any such collective for skyrim

Not exactly sure what you're looking for, but search around the http://www.skyrimnexus.com. There are mods that add extra loot and things like that.

Also, I've heard good things about the http://skyrim.nexusmods.com/mods/19447/ mod.

cool tools duide./

Hey you've gotta do 125 Thieves Guild sidequests to get "the safe".
Has anybody honestly done that?

Geez... it's tough enough to do the minimum 20 sidequests to restore everything back to order.
I'm trying right now, but on previous playthroughs I always just get out of there quick (do the Nightingales etc.)
It's tough to bring the TG back into glory again! Not to mention, I find it... unpleasant.

So, looking for DLC mods, you've done all these things already?
You like it, eh? That'd make it easier I guess...