The HTC Evo Shift 4G now has support for ROM Manager and ClockworkMod Recovery, if you’re the hacking type. There were some concerns over recovery being able to backup Sprint’s WiMax keys. but that seems to have been resolved now, which was the only thing left stopping the process from installing correctly.
You’ll need to be sure your Evo Shift is rooted first, and then the easiest way to get it going is to use the ROM Manager, which you can get here as well. The ClockworkMod Recovery version for the Evo Shift is listed as version 22.214.171.124, and you can download it manually from this location, just look for “Evo Shift” in the download list.