<t> Is there any point attaching combat support units (excluding flak) to army and above level HQs? Many army HQs have this arrangement at the start of the GC scenario, but it doesn't seem to make any sense as support units only commit to combat for units directly under the HQ they are attached to ...

I've noticed that when using the improved CV calculation option the defensive CV values for units in clear terrain is often significantly less than the unmodified CV value. Shouldn't they be the same?