I'm currently developing a minimal userscript manager who's main goal is to be fully auditable by any user in only ten minutes or so - my prototype uses less than 300 lines of javascript, and I'm trying to keep it that way.

To get the codebase this small, however, I have to be very picky with what features I implement - most notably, the code editor has to be very barebones. Are there any features that I'd be shooting myself in the foot by not including?

For example:

• syntax highlighting
• cloud sync
• regex url matching
• fullscreen editor (currently, it's just a browser popup - the intention is that you write code elsewhere and paste it in)

Any feedback is greatly appreciated!