ROOTing & ROMing for Tether & Underclock?

rawfuls

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Mar 27, 2012
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Mainly asking for my good friend, who owns a Droid Bionic.

His primary goal:

-Underclock processor/phone itself
-Tether (wirelessly preferably).
-Simplicity!

He said he wants to underclock because he really doesn't need so much speed, especially when so much heat is built up from it. In addition, he rarely uses the phone because it heats so much.
By underclocking, he's hoping to reduce the heat by a little bit (if not a lot), and furthermore also make the battery last a tad bit longer.

Tethering:
Would like to use his laptop with his phone, or maybe iPod.
He uses .5GB/4GB on his bill, so he has plenty of bandwidth to spare.

Simplicity:
A stripped version of his current version: 4.2, without all the VZW add-ons and other shenanigans.

Themes:
He's a typical kid, so he likes something that will look "cool" lol.

We are totally new at this, so any newbie-friendly guides are more than welcome.
Lists of possible ROMs/Ways to accomplish this are also welcome!