Please consider adding a systray icon and menu on Linux, per the freedesktop.org specification.
If user privileges are a problem, then maybe:
1) a configfile option could be added to specify which users get a Privoxy icon in their systray, and
2) the menu could start out read-only, but operations that require superuser privilege would prompt for a password the first time (in each X login session) they are used.
For troubleshooting the actionsfiles, the systray approach would be a big improvement over requiring a user to keep the enable/disable bookmarklet open and to manipulate the logfile manually (keeping a terminal window open to clear the logfile when desired, etc.).
Thanks for your time.