It seems that daily, I see some question along the lines of "issue X is causing my phone to be inoperable, and debugging is off. How do I enable ADB to get my data?"
I understand that this issue can be fairly common, so i thought i would put out a way to re-enable adb - using nothing but root privileges and a custom recovery.
This can also be used when, say, my developer options cannot be opened for some reason.
I know this will not eliminate this kind of question, but it can help with some of them.
See answer for method. Had to upload this as a "answer your own question" thing