topic
*cough*siege*cough*
*cough* seige requires 1.2 features *cough*
You can only do so much with the 1.1 feature set. You can build maps with stage based elements (e.g. uncreation) or perhaps include a switch that a team needs to defend, etc. The 1.1 feature set was meant to be sufficient for the 1.1 gameplay. I.e. Where the only objective is to destroy the opposing team and prevent them from respawning. You can't really add another objective since that is the only way to win the game in 1.1.
I'm looking forward to the 1.2 release - I'd like to make an objective-based map.