OK, let me rephrase the quesiton. I certainly can open edgeActions.js and tweak to my heart's content using Sublime Text. What am I running the risk of doing that's bad when I save the program out of Edge. Will it preserve my changes or anything else I should be aware of before using a different IDE?
Wow. My life has changed learning Edge since moving to Sublime Text IDE. Just editing the edgeActions.js with code hinting and formatting and area commenting etc. has made life so much easier, for anyone looking for a good workflow. Just an FYI.