Since this is your first post i'll go light.
On the top right hand corner of the forum map for "myTouch4G Themes and Apps" you'll see "search this forum". You can search that specific forum for a keyword or key phrase. I know there is at least one thread here but you'll have to dig it up, search for "4g icon".
Secondly, What kind of "battery mod" are you looking for. That's like saying "I want a hamburger". There are millions of ways of doing it. Settings > CM Settings > Status bar tweaks > there are a couple battery options.
I really like it. I'm running a OS called Revolver. Slightly overclocked. It's nice. I've got a friend with an iPad who even commented on how fast it is.
But i run a zip-align, and defrag every time the system is booted. It takes a while to fire up, but once it's going it's gone.