I've changed over to direct template editing (instead of using the original TMS addon). I still prefer the switchable on/off of TMS, but direct editing is working. Because I often have edits in multiple sections of a template, I am constantly using the "view custom changes" feature. I have to stay away from the "Revert Template" button as this will wipe out all changes. Sometimes I need to "view custom changes" just to grab original code to fix a bad edit.
Is there somewhere I can change the overlay dimensions so the overlay window is larger? This would let me see more of the code.