What kind of pro plans do you have in mind for this? I could use this for demonstrating slight UI changes of a design, but I would want it to be private.
Yep. Private plans + a whole raft of other features I didn't have time to implement (SSL support, regex substitution on html, basic auth support etc etc). Any other suggestions?
May be optional code obfuscation.
I completely agree on the ability to make private "haxx". This could be a very useful tool, if they gave that option!