Yah, I took my Effect_Tick.ogg off my nexus and renamed it to those 2 files and then added the 2 you mentioned (after backing up the originals and changing .ogg to .bak). It did not work immediately, but after a quick restart I am one happy customer. When I get a system update, will it screw these up again? It's an easy fix, but just curious.
Maybe I'll spend the rest of my day changing my battery full sound to a burp.ogg =)
For anyone else who wants to do this, just download root explorer and replace the files previously mentioned and make sure the permissions are the same. Attached is the file I replaced them with from my Galaxy Nexus.