Well, yeah. That's the idea. You roll until you get the numbers you want. There's a reason I only proposed to implement this option for the highest difficulty... in order to play the highest difficulty and still have fun with it, I'd like to have at least 4 18s in my Ability Scores without going lower than 10 in the other two.
I would not call it "abusing the system" if there is a difficulty that almost requires it.
Another point I forgot to raise in my opening post: a character that uses Charisma and/or Wisdom as a dump stat will be locked out of many dialogue option (i.e. such a character will have almost no chance to pass the various skill checks). This will lock such a character out of many possibilities, and while it is true that this adds (rather artificially, I might add) to the game's replayability, the full game will probably last 70+ hours (but probably many more) and people won't like it to wait that long to see what was hiding behind those dialogue options.
