There are currently two options for changing the source model of an action.
The first being in the Import Data Sources section in 'Actions' where users can change the data sources for actions one by one. The second is by going to 'Source models' and editing mapping for a source model. This changes the source model for ALL actions which come from that source.
What would be awesome would be the ability to change a large group of actions with the same source model to a different model all at once.
Eg: If you have 100 actions from one source model and you want to change the source model of 30 of them, you would need to change all of them one by one. The ability to change all of the actions in one click would be extremely useful.