One of the optional rules I'm curious to find out if you guys are interested in using for 2EE is the hero point system. Hero points aren't so different from the system for action points presented in d20 Modern or Unearthed Arcana; essentially, a PC can spend a hero point to be able to do something he wouldn't normally be able to do or gain a substantial bonus to a d20 roll. There are a handful of feats available to characters using the hero point system; one of these even lets NPCs who choose it to use the same system. Very rarely, there are scenarios where using a hero point (or trying to) can have repercussions for the adventure; for instance, in the D&D v3.5 adventure Expedition to Castle Ravenloft, using an action point (or hero point, in Pathfinder) in Count Strahd's castle to augment a die roll, and failing that roll, gave Strahd bonuses.
Under normal circumstances, characters receive a hero point every time they level up and can have no more than three at one time. There are a few other ways to gain new hero points, like performing exceptionally heroic deeds, completing story arcs, returning from the dead, or so on. In this campaign, I'll be starting a thread where everyone can post descriptions of their characters' personalities and backgrounds to help refresh everyone's memories about who they're adventuring with. If we decide to use hero points, everyone will start with a single hero point, or two if they post their character biographies before the game starts.
There are also a few spells and magic items for use in a campaign utilizing hero points. Finally, there is a feat tree for humans in the Advanced Race Guide that kind-of, sort-of replicates the use of hero points, but they aren't mutually exclusive. Also, I should point out that if we decide to use hero points as a group but that one or more of you aren't interested in using them for your character, you'll receive a single bonus feat as compensation. Such characters are referred to in Pathfinder as antiheroes.
You can learn more in the Advanced Player's Guide, pp322-25, or here at the Pathfinder SRD.
So yeah, what do you guys think? In terms of game balance, the hero point system is a great example of a system that is almost never utilized by NPCs or monsters. It only ever really makes the game easier for the PCs. It also provides for some really spectacular situations, but your mileage may vary; sometimes people do silly things with their hero points, like using them to score astronomically well on Knowledge checks that turn out to be irrelevant to advancing the plot, or to give themselves just enough rope to hang themselves.
For example, you can use two hero points at once to "cheat death;" basically, an attack that would kill the character outright turns into one that drops him to the next nearest negative hit point, where he stabilizes automatically. I once witnessed a PC with two action points spend one to race outside a burning building to pursue the arsonist, where he was set upon by all the bad guy's friends. One cast hold person and another coup de graced him, which was only successful because he had spent one of his hero points instead of saving it. At the other end of the spectrum, the precious nature of hero points sometimes misleads players into hoarding them rather than spending them judiciously. Recently in my home game, a character rolled an 18 on a Reflex save to avoid falling into a pit trap. He had a hero point, and wasn't aware that he was only within two points of the DC 20 (well within the margin of a +4 bonus for using a hero point after you see the die roll). Just a few rounds earlier, he had observed another player's character fall into a different pit trap and emerge relatively unscathed. He declined to use the hero point, not knowing until it was too late that the bottom was lined with spikes. He was killed outright.
Anyway, let me know what you guys think. If you vote yay or nay, please leave a comment to that effect with your reasons why.