Found out something interesting about MMS: WinMO6.5 DOES NOT come with an MMS client by default. Disabling PowerMobia disables the MMS part of it too, so you need just an MMS app.
Arcsoft has one.
Getting MMS to work with WM 6.5... - xda-developers
anyone with a Fathom want to try this if they've already removed the PowerMobia? I haven't yet, but if this works, I might as well. May even roll up the .reg's and this arcsoft into a "Remove the Arcsoft crap SMS program" cab.
Let me know if it works.