Finder preferences. And org.chameleon.plist in Extra folder for the boot flags (search my post, man, i won't type those key/strings again).

I strongly suggest you to use Path Finder instead of the 32-bit Finder. DP2 finder really sucks, and has some copy/paste/trash issues that are really annoying and tricky to solve. Path Finder works quite well and add some features, like the ability to cut files instead of just copy/paste, and some built-in features that substitute ones from Lion's core services that will like malfunction on -legacy mode. The downside is that you can use it free for only 30 days.