The latest stock LG ROM was 2.3.6. However, there are Ice Cream Sandwich (4.0.X) & Jelly Bean (4.1.X / 4.2.X) ROM's available on the Cyanogenod forums. FYI, the Optimus Sol (E730) is exactly the same as the myTouch 4G (E739) except they both have different kernels. Gingerbread (2.3.6) is much faster, however there are functional ICS & JB ROM's. I recommend Penberrom 1 or LeoDexed for GB, Penberrom 2 for ICS and AOKP JB, EnlighteneD or Hollo II for JB. Let me know if any links on the CM forums are dead, I most likely have mostly everything on my PC.
For your power button issue, check out the Power Button Remap mod.
I hate to say it but I just can't find any that's at least android 4.1. I couldn't find Hollo II anywhere and EnlighteneD had a few ending posts that didn't get confirmation for E739's so I was a bit fearful. AOKP installed as android 4.0 and did provide a secure screen setting to wake the screen using the volume buttons without the need to remap keys. If nothing else, I'll be using Penberrom 1, like you said, it's fast.
Thanks for the help!
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