OK. First off, 88 good. I like it and have been wanting it for ages. It would help out the field defences imesurably, and would help prevent the bombers from becoming glorified JABOs. An 88, would be a welcome addition to AHII it has the right combination of utillity, and history. It's lack of armor will make it non Uber. It will also force the use of "Scout" vehicles(Jeep, M-3, M-8, M-16), and attack planes, to find them and destroy them. The 88 is already moddled in the Tiger I, the AP, and HE shells are already there, and just borrow the code for the AA ammunition from the 5" shells and were golden.
Second, any time delay IMHO, is a bad idea. Simply because the unit is weak on defence. If it is moving, and chances uppon a tank, it is dead. Even without the delay to set up, it has to traverse the gun to put it on target. That traverse is slow, and a pintle 0.50"on an enemy tank could swing arround and would kill the gun/crew with a 3-5 second burst. Swiching between round types is automatic even in the 5" guns, so a delay to swich round types will have to go out the window.