T1 mobile arty need firing clocks (yellow bars that tell you how long they have until they are done reloading, for teh nubz)
just like T3 mobile heavy artillery, T2 artillery instillations, T3 heavy artillery instillations, T3 rapid-fire artillery instillations, experimental rapid-fire artillery instillations, experimental strategic artillery instillations, all indirect-fire missile launchers, slow firing units like the Novax Defense Satellite, T3 sniper bots...
You get the idea.
This is especially important when considering the UEF t1 arty's rate of fire. A firing clock would make them much easier to control, in addition to the other mobile T1 mortar tanks.