Android limits you to 100 texts an hour..
Now I rarely hit the limit but it does happen. after the limit it says are you sure you want to send after each message and if you forget to hit ok it doesn't send.
Now I was introduced to elitebomber sms app. Were you can text bomb people... it sensed i have a rooted phone and asked if I would like it to do away with the limit.
I don't know if this is popular enough to get rom dev's to bake it in. but maybe if its universal it could be made into a zip that works across the board? just thought if I was curious others may be too.
The sms app was banned from the market I can post the APK if someone's interested.