I think it would be good for the Scripts Editor to allow quick and direct access to the tabs with just one click, as mIRC itself already does through rclick on the toolbar.
My suggestion is:
We have a command /scriptseditor -r <N|filename> - which opens the script editor if it is not already open, and then makes the remote tab active and shows the Nth remote script file, aliases, Popups or the <filename > specified if this file is loaded, if N or filename is invalid, open script editor in remote tab with current remote script.