Sorry, wasn't thinking straight

Here's the guide, be wary, you will have to wipe your data!
I know how to get it working. Just letting you know in advance- you'll need to go on an epic journey of epic proportions, decompile, recompile, sign, edit countless xmls, and deal with command line tools. Or... just push the file that I linked to
After downloading the file, do the following. (note- have ADB set up! It's pretty easy, and it helps with countless things)
Open up an ADB shell, and enter this
Code:
adb remount system
adb shell
rm /system/framework/framework-res.apk
exit
*don't copy this bit here- make sure you're out of the adb shell before proceeding!*
adb push *location of my framework-res.apk* /system/framework
adb reboot recovery
Remember- enter line by line. When you get into recovery after typing in the last line, do a FULL factory reset. Not just cache, a full data/dalvik/cache wipe. Unless you do, it WILL bootloop repeatedly. Reboot back into Android, it may take a while, be patient. If it doesn't boot after ~5-10 minutes, pull the battery and try again. If it doesn't boot then, let me know.
Anyway, after this, you should have working MMS on Sense 4! Let me know if you want to know how I built the APK!
Download for APK:
http://dl.dropbox.com/u/75805861/framework-res.apk
Also, if you are curious about how I managed to get that file, I took the apns.xml found in framework-res.apk (/res/xml) from the stock VM image, and put it in this one. Works like a charm! ^_^