Allow for action modifiers on Action->Output connection

[lilyball]

When creating a workflow, you can double-click on the Input->Action connection to set up a modifier for that connection and custom subtext. But there's no way right now to run the same script for all modifiers and merely control the action taken, short of duplicating the script (and yes, you can put a common script in the workflow and call it from each action, but that can be a bit annoying). It would be nice if you could instead set the Input->Action connection to a new value "any" and then configure the modifier and subtext on the Action->Output connection. For example, I might have a script that spits out a filename, have the default action do something with that file, and have option-return do something different with that same file.