Would you plan to develop one more engineer to operate the vehicles? I mean those who can drive and repair, and who could fight with enemies if its vehicle is destroyed. One more thing, would there be a way to have those engineers follow certain formations, like a phalanx set by players?

So as you can see the vehicles are still a little confusing to use. They are as they were in 1.6.4 but I have some ideas to improve these.

First of all will probably display overlay when player starts looking at one - something like "right click to start using / shift right click to access inventory".

Also once seated I am thinking of displaying keys you can use to move around / aim (all of them are in controls menu, but I am guessing players can easily miss that). Possibly hiding this info and having something like "Press [whatever key combination] to view controls info.

I will leave this open and feel free to add any idea you have on this.

Siege engineers were added in the latest release, the repair and move AI are planned in a separate issue and formations are on my list of enhancement even though with a very low priority so closing this issue now.