If you have invested the skill points into breaking open locks, you simply shouldn't fail on a typical lock (this is why I actually remove critical fails when I DM in Dungeons and Dragons).
It is not because you know how to run that you can't fall or sprain one's ankle.
When he's talking about screwing up the balance, I believe he's talking about scumming. Being able to kill respawning enemies will allow a player to scum exp until they're overleveled to fight bosses etc instead of becoming better at the game. It also gives the player too much wealth and too many skills on top of these levels from acquired wealth in said scumming.
This is really a balance issue. You don't have to give 1000 gold or 1000 Xp everytime you kill a mob, or chain-spawn them...We will see.
Respawning is all about exploration, discovery, replayability and a strong sense of surprise. Its the difference between doing a factory job, and being an explorer. I know what I want to do.
@Raze: yeah, this kind of stuff sounds good.
