1.) yes it would. you will need to deodex the phone to get the black status bar back,
2.) you can keep root by moving su from system/bin to system/xbin BEFORE you install the leak. after that, find the update.zip to deodex that includes the black status bar, and at that point there are tons of themes you can apply. lemme find a link to that deodex link for ya.
edit: here is the link that will help you deodex your 2.2 leak.
[DEODEX] Update.zip deodex - Droid X Releases - AllDroid Public Board - [DEODEX] Update.zip deodex - Droid X Releases - AllDroid Public Board - AllDroid.org > Home
although, here are a bunch of roms out there that are already deodexed once you make it to 2.2. best of luck, and please let us know if you have any questions.
also, here is a great list of ROMs and themes compiled by Droider (D13) that you can use once you update. IMHO, FlyX is awesome, and it will deodex your system for you.