Is there a way to run a omnifocus plug-in from a shortcut?
Yes! You can use a URL to run a plug-in action.
See the shortcut linked below as an example; you need to change
com.KaitlinSalzke.Scheduling to the plugin’s identifier (you can find this in the plugin file) and
newDay to the name of the action (i.e. the name of the file).
If there is only one action, you could use something like
Thats awesome!!! Just got it working and will make a huge difference. Now can add a project with several task right from a widget!!!