WED can auto-reload your scripts. Everytime you update a script, and then change to WED again, it can auto reload it.

[WED] ==> File ==> Preferences ==> ADVANCED ==> "Reload of externally modified files:"

Auto reloads it automaticaly every time, you do some changes, save your script and then switch back to WED.
Prompt asks you if a script was changed and you switch back to WED.
Disable ... nothing