Ok the first suggestion is a suggestions sub forum, and the second is this:
On large (wide) maps have 'nodes' you can build only in close proximity to the node (determined by how big the node actually is) or between two nodes, but you must capture the nodes in order for example:
N---N---N
where N is a node, if you had the left one and captured the right one you would not be able to between the nodes (explained as the node interrupts it maybe?).
To capture a node you would have to build (order a brain crab?) a brain, put it on a robot then walk the robot to the node and put a brain on it.

The requests subforum is generally used for suggestions.

This is probably possible to make in a Lua scene.

Or you could make it so capturing a node automatically makes one part of a bunker appear. Capturing all the nodes = complete bunker.