[PvK]

Ya, if you defend the far (enemy's) side of the warp point, then even in SE3 (where warp points can be used during combat) the AI won't be able to "retreat forward," since retreat will just back them away from the warp point. So in order to warp-point-blockade-run, you'd need to hold your own side of the WP, warp, use retreat, and hope to survive the defenders and still have a 2-point speed advantage on the far side.

PvK