You're welcome to help improving the sansa e200v1 radio, we could set you up with the datasheet possibly. Tuning with the e200v1/c200v1 fm chip is a bit trickier than with many of the newer fm chips (like in the ams sansas, the clips, e200v2, fuzes).
For the presets: you don't really have to enter text, you can also create presets without a name. Rockbox just gives you the option to enter text, you don't have to.