> Restarting Emacs helps verify that customization will persist between sessions. On this point I agree, but another (better, in my opinion) option is to hack

> Restarting Emacs helps verify that customization will persist between sessions. On this point I agree, but another (better, in my opinion) option is to hack in one instance and spawn a second to check the config changes you're making. You can kill and recreate the spawned one with less interruption to your work.