The MMS package carries the verizon name because that is where it came from (the verizon ExtRom). However, it is setup to work on both Sprint and Verizon.
Anything that is optional in the BuildOS can be removed (as far as I know). To make OEMs load last, name the OEM something like "Optional_zzColonelCustomize". And, make sure the dsm\rgu UUID starts with ff.....
Also, now I am having a little fun. Maybe this will either reduce some confusion or cause more.