The ability to "fold/hide" functions or blocks of text. The folded line will have a little icon such as [+] indicating that something is folded/hidden. This will make it easier to see a list of functions than the functions which will make scanning though source a lot easier, esp. with functions that are very long.

a way to implement this (user side) would be to select a block of text then right-click and select fold/hide code. line numbering should remain consistant whether folded or not folded. also an option to "fold/hide all functions" and "unfold/unhide all functions" would be nice too (each function, if enabled by the user, should have the [-]/[+] next to the line number.