Forum adverts like this one are shown to any user who is not logged in. Join us by filling out a tiny 3 field form and you will get your own, free, dakka user account which gives a good range of benefits to you: No adverts like this in the forums anymore. Times and dates in your local timezone. Full tracking of what you have read so you can skip to your first unread post, easily see what has changed since you last logged in, and easily see what is new at a glance. Email notifications for threads you want to watch closely. Being a part of the oldest wargaming community on the net. If you are already a member then feel free to login now.

I am averse to at single unit acting more than once in a single turn thpug I suppose that a fatigue mechanic might make up for that. A phase system allows units to perform different types of action during different phases and these might be exploited to perform the same sort of action twice in a turn at the expense of tactical points. Something like that seems OK ... I like your idea of using tactical points to retain initiative during a turn but how do you mitigate imbalanced quantities of units on either side of the table? Did I miss that part when I quickly read your initial post?

Personally I liked the old overwatch counter mechanic much better than the way that overwatch is handled in 40k these days.
As for your stack mechanic it seems to be a good idea. I can see how it helps to reinforce the overbearing weight of numbers that mass infantry should represent for example. Seems to make things more difficult for smaller forces but maybe this is the way that things should be in many contexts.