This simple entity can be used in Hammer to create brush based objective zones. It currently can be set for 'retrieve'( vip, hostage or literally retrieve an item ), 'defuse'( classic bomb defusal ) or 'hack'( hack a console or literally use any combination of i\o and props to create custom scenarios.
Other entity settings include : Instant Activate, Instant Deactivate, Instant Complete, Target Team, Optional Target, Primary Target and Target Number.
You can use this entity to make a Rush game mode with custom objectives as well as CTF. I am working on adding more features to it that will allow for King of the Hill style objectives as well as move able spawn zones. My game rules are set up to allow ten instances of this entity per map in any combination\order.