There is now a short menu to control the source from staging by shift + right clicking (Source menu actions available are "preview source table" , "go to source table", "customize code", "view query").
Can you also add the "incremental" or "differential" selection rules?
I think this should be possible since source <-> staging is a 1 on 1 mapping.
Also add an option to select new fields to be imported.
In the source you can edit the staging table options but mostly in established projects you are working from staging and not so much from the source anymore.
While you are at it, can you also add "go to source data provider"?
This can be handy if you have to synchronize your data source to retrieve new fields.