This might seem very trivial, but I think that if it was possible to choose a smaller font size on the PDA (when writing the programme), and making the word wrap optional, would make it much easier to program on the PDA (alternatively a zoom feature as in the PDA-word programme).
I for one want the word wrap its better than scanning to see the code. I strain comes from too small a font
If you want a longer line use lanscape mode