Lets say you placed a single wall. It would be a connector, long wall, connector.
Drag a box so that you first select that connector, then pull it over the long wall. Let go of the box and it will have selected them both. Now look where it says you can make a gate. Click it and what do you know, they're BOTH gates! Looks really odd because youve got a gate sticking out next to your normal one. All you have to do is get the connector, then the wall, then you can drag it over any amount of walls. It will turn every single one into a gate. It also works if you select a short wall in the group. So far it works for me every time. The advantage is that now your units can walk through the entire area of gates with no segments in the way, and your enemy has to destroy more to get through because your wall connector or short wall takes up more space. ES will probably remove it in the next patch, but it's fun while it lasts. "A planet does not explode of itself," said dryly
Earth
the Martian astronomer, gazing into the air.
"That they were able to do it is proof
that highly intelligent beings must have been living there."