Smart List Pushed to Ad Network - Keep in Sync

Hello, 

It would be nice to have another option of the types of push available to push a Marketo Smartlist to an ad network. There are currently only two types: 

- Add Leads to audience

- Remove leads from audience

It would be nice to have another option such as:

- Sync leads to audience

so it can reflects the actual current smartlist in Marketo (with all the current filters), and not just add/remove contacts. 

Thanks,