I have been following the installation exactly as you have had, and everything had worked perfectly. Until I installed the DellEFI installer, and had selected "dual finger" feature, and had made sure not to select PCEFIv9. I then installed Chameleon, but forgot to delete the extra files. I then rebooted, and realized I forgot to delete those files. Now, the resolution is very low, and the trackpad does not work. What do I do to fix this?
Also, doing a retail install, is it safe to do all of the "Software Updates"?
Yeah, this is one of the things I encountered, too, which led me to add the steps about deleting the Chameleon "Extensions" folder. You can:
a) plug in a USB mouse,
b) boot up in safe boot mode by hitting Tab at the Chameleon device selection screen and typing in "-x" as a boot flag, then booting. (I had to actually hit Esc and then enter to get it to boot for some reason.) That will boot with minimal extensions, and you should be able to do the same thing, or
c) boot into OSX anytime using the DellMiniBoot CD/USB.
Then, delete the Extensions folder, run the UpdateExtra app, and reboot. I think that will reload the Extensions.mkext file in the Extra folder, which will cache the correct extensions. You should be good on reboot. I've never installed the two-finger scrolling, because I know there are issues and that there are better options - I just haven't tried them. I don't think that's the problem with the trackpad, I think that was another Chameleon issue. It was that way with me when I left the Extensions folder in place as well.
That should get you back on track. Oh, and yes, software update should work just fine, but be ready to reload those DellMini9 extensions anytime you do anything major, along with any special kexts you install from this point on. The /Extra folder is supposed to be safe from updates (mostly big ones like the .7 OS update) but there are still some kinks, for some reason. Updating things like iTunes and such should be no problem. As a safety, I keep all the kexts I load on my own copied in a folder somewhere, then I can drop them all back in at once if there's a problem. Something else I'm working on cleaning up.