Yes, that will do it nicely - or DiamondTweak if you have it already installed.
I use PocketShield (much thinner than s2u2 but you have to $$) well worth it - it swaps out the dialer and does the volume bubble too,... because if you just go back to the WinMo standard skin and still have the HTC volume controls active you can't change the in-call volume,... so you need this cab:
http://forum.xda-developers.com/show...80&postcount=7