any way to remap keys for only one app? I've seen the system wide tools (that all seem to just manipulate the default key bindings) that allow you to swap keys around, but has anyone found a way to swap keys for just one application? (no, the app in question doesn't offer it, and the author was a bit of a prick about it when I asked if they could enable an option to adjust them.)

I'm talking about real keys like home, end, page up, page down... not shortcuts.
Keyboard Maestro might be your thing. Make a new command group which only applies to the application in question, then for each key you want to remap, make a new command with a hotkey trigger set to the real key and an "Insert Text" action set to what you want the key to be.

The only shortcoming I've found so far is that it can't handle the in-built volume control keys on an Apple keyboard. It can detect them &amp; act upon the event, but it can't suppress the volume change. In fairness, nothing else can either. Most programs I tried can't even detect it. Keyboard Maestro is the king of the pile.