Tony Vargas
Legend
To put that particular stunt in perspective, though, I'd say it's a good thing you decided to Cleave. Because ale doesn't burn. Even distilled liquors don't burn that well. Heck, even the lamp oil typically used as a classic D&D incendiary doesn't burn that nicely on it's own, it needs something act as a wick (like enemies' clothes or fur, fortunately). (Now, another DM may decide that fantasy ale burns like gasoline - but that's just another reason that leaning too heavily on adjudication is a poor design policy.)Giving people a set of choices is in a way limiting their choices because they'll tend to default to those choices. If you offer someone Coke or Pepsi, chances are that he's not going to ask for lemonade. Likewise, the stunting system is still largely DM fiat. In the encounters game, I considered running behind the bar, splashing ale around, and having the wizard light it aflame. Then I realized that I'd probably have to spend two turns doing that and make some kind of skill check, and I used Cleave instead.
In retrospect, I wish I had lit the bar on fire anyway.
The flip side of the point you're making is that lack of worthwhile/interesting options may well encourage players to 'stunt' when the stunt is likely to be pretty worthless, itself, just because the game sucks so hard it's not worth playing their character as modeled in the rules. You're counting on the DM to feel sorry for you because you played a character with inadequate mechanical support and thus let you do things that probably wouldn't really work just so you can eke some kind of enjoyment out of his game.
It's not a fun position to be in as a DM, having some players with an embarrassment of effective options (20 spells to choose from, or even 4 cantrips & 3 1st & a crossbow, at 1st level) and others bored to tears, looking for some way to contribute, or at least act out in a way that reminds everyone they are playing a character, not just going 'ooh' and 'aah' at the arcane fireworks.