I'm 50-50 on giving Churchill smoke shell. If Churchill ever gets a smoke shell, the shell needs to have a high cooldown, otherwise it will be pure cancer to kill the Churchill. On the other hand, giving Smoke shell to the Churchill will allow it to protect the rest of UKF assets, while being difficult to kill.
I'm 100% behind infantry support smoke (yellow cover + reduced incoming suppression). However, we first have to evaluate just how powerful Tommies are, given the rest of the nerfs in the Brit faction.
The CD on smoke shell should go down anyway.
Infantry support smoke does not have to provide light cover, just activated the cover bonuses of UKF infantry that are in the smoke. Those bonuses are allot both defensively and offensively.
Churchill should also have access to the commander upgrade as all UKF Tanks should.
A player choices on units should reflect game style preference and not simply better stats.
A player want to use fast tanks aggressively he would go hammer. A player want to use heavy tanks combined with infantry he would ho anvil.
(As faction designed it would be allot easier to balance UKF in the Hammer/anvil choices had more impact on UKF units/emplacements. For instance UKF units could be toned down but have hammer engineer increase speed reduce size and anvil engineers increase armor/HP)