[Feature Request] Improve options for application focus per page

[DeanKellham]

Currently each page can only be set to activate on one application being focussed. I'd love to see the ability to activate a page on an array of applications (such as various games, or various tools used in a workflow). This could be improved even further by letting us use a form of "window title contains [string]" to match which page is displayed - with conflicts being decided by page rank / order?