Hi! I made a little changes to Mms.apk.
It is black version of this app with disabled smileys.
I know it's not perfect, I just made it in one hour. Please feedback, maybe - if there's gonna be some interest - I'll follow. ; p
Currently, when composing a message, in MENU there is "To GSM alphabet" which actually works only with polish diacritics - to prevent sending messages only 70-signs long. After composing, select this option to convert all ąęś->aes. If you're not polish and would like to have similar possibility with your language - I can make it possible drinking some beer. ; p
Go to recovery, mount /system, connect phone with USB (not MS-USB mode, just cable) and in console:
adb push Mms.apk /system/app/
adb shell chmod 644 /system/app/Mms.apk
Just simple replace... Actually... I removed Mms.apk from /system/app and I'm installing this new modded Mms.apk as a standard application. ; p
This was tested on 0.4.1-0.5.4. On 0.6 will work as well I guess...