Yes, we can "enable plugin temporarily by ignoring the
disable-setting/file and if the plugin fails the user can simply go
back and everything will still work", I like this solution.
I don't. This is incredibly hard to get right since you don't know
what the plugin is intended to do. For syntax plugins you'd need to
generate a fake page containing the right syntax to trigger the plugin
(just calling it's methods might not create the needed context). Even
catching simple PHP syntax errors could prove difficult by just
examining a iframe or AJAX content.
