Taking that https://trello.com/c/roPHicAs/357-generic-entity-types for generic targets support got no description, let me put my 5 cents.
What is node creation workflow now:
1. Select action (for action nodes) - game will filter out targets based on action. Selectors are out of scope for now
2. Select target - game will filter out filters based on target
3. Select Filters
My idea is to replace second step with:
2. Select multiple targets - game will keep only filters common for all selected targets
Counter targets are not included so we can move then to separate category. Here is how it might look like:

And how nodes might look like:
What is node creation workflow now:
1. Select action (for action nodes) - game will filter out targets based on action. Selectors are out of scope for now
2. Select target - game will filter out filters based on target
3. Select Filters
My idea is to replace second step with:
2. Select multiple targets - game will keep only filters common for all selected targets
Counter targets are not included so we can move then to separate category. Here is how it might look like:
And how nodes might look like: