everyone knows the script editor needs severe help... but it's hard to deal with that when there always seems to be much better and more important things to fix.
for this reason, i think it would be a grand idea to have the ability to change your script editor to whatever you chose. lets say someone wants to use notepad, or microsoft word for some strange reason. the reason i think this is important is there are text editors made for programming such as emacs and SciTE that have syntax highlighting and all of the programming bells and whistles. you could get the benfits without actually needing to code them yourself.