Hello,
I've come up with a little custom build package for Sublime Text 2 (a nice and powerful code editor).
Basically you write ExtendScript in ST (which is way way nicer than ESTK as an editor), then with a single build shortcut ST copies the JSX in a proper place and runs it in PS.
It can't replace ESTK altogether, it's not rocket science but it can speed up things a little bit more - and apparently no-one did it before but for After Effects
You can grab it here.
Cheers,
Davide