IDA Set Thumb Range

auto start_ofs, end_ofs;

start_ofs=AskAddr(ScreenEA(),"What is the THUMB start address?");

end_ofs=AskAddr(ScreenEA(),"What is the THUMB end address?");

while(start_ofs < end_ofs) {
  SetRegEx(start_ofs, "T", 1, SR_auto);
  start_ofs=start_ofs + 2;
}