With a special coupling button that would be only available for Urbanmeches and Assault meches the pilots could within a sertain distance from eachother couple. Both pilots should press the coupling button and have their reticle pointing at the mech they wish to couple with.
After this the Urban mech would attach itself to the back of the assault mech. For example an Atlas. There does not necessarily need to be any special animations the Urban mech could simply "teleport" if that is easier to do technicaly.
In this coupled state the Urban mech would have a very limited torso twist but could still guard the back side of the Assault mech. At any point the Assault mech or the Urban mech could press the special coupling key to detach. This way again there is no forced coupling and both pilots are doing it from their own free will.
I think this would help the heavily armed urban mech builds alot since for example the AC20 wielding Urbie can only go 30 kph and beign coupled in the back of an assault mech one could be transproted to the action faster.
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