I'm not sure how to fix the vce delay because it's built into the mod, but I'll look into it.
I'm also not sure how to fix getting trapped if you advance to far, any ideas on that would be great.
Since both teams go to the same class selection area, perhaps you could have the doors physically open to that room - it would solve both the disorientation and the VCE problems.
If a player on an enemy team clicks on a door past their furthest capture point (other than the capture point doors), perhaps they could be teleported back to that capture point - somewhere out of the line of fire, of course.
EDIT: On a few less serious notes, there's no way to close a door - one of the prisoner spawn doors is jammed open. The SWAT doors also teleport them a couple hundred studs, meaning they might never even see prisoners heading for the SWAT capture point.