you can use xbmc for for games (i'd get it) and the mc360 skin.
(#xbins) changing evox to unleashx is easy (+ unleashx is a better dash) theres an ftp program in unleashx
anyway to make it your dash get it from #xbins, unzip it, connect to your xbox, delete everything in E: dahboard and replace it with the unleash x config.xml, english.xml french.xml, spanish.xml, and default.xbe.
about halo cache editor.
get v0.7 from #xbins unzip it, ftp it over to your box in E:apps and boot it up
from there its pretty simple, press a on what you want to change , move to what you want to change with, and press a