You can't do anything on Hero's Editor, all it does is edit. On the other hand, with the use of Plugy, you can do the ubers. Note that it is not the same kind of ubers (ie in Uber Trist they don't have all of their minions and whatnot).

Plugy does a bunch of different crap; I don't remember everything off-hand, but some features include: unlimited stash (aka muling), ability to transfer with the shared stash, stat/skill reallocation, ability to do ubers, etc.

Plugy is a program that is generally accepted in the mod world, although some mods block the use of certain functions (ie Median blocks the reallocation of stats and skills, amongst other things).