I was about to post the same suggestion: a tactical pause button, pretty please.
I'm a F6 player, basically. I've tried doing tactics with the menu, but I find this difficult, awkward and slow, and just absolutely not enjoyable. It is possible that I would get the hang of it eventually. But the (single player campaign) game offers little opportunity for that, unless you are willing to save-scum over and over again. By the time I'm working on my second command, the enemy is upon us and it's either pressing F6 or losing. If there was a pause button, I could spend my time setting things up. And maybe after a while I would be more familiar with the menu and get faster and better at the mechanics, until one day I will pause no more. But if it stays as it is, I will simply ignore the tactical side of things entirely, which is a shame.
I have a hard time understanding how anyone can be against a pause button (in single player). If you don't like it and don't want to use it, then ... well, don't? This would be feature, not somehow imposed. It takes away nothing from the realism unless you choose to use it. Heck, if you are concerned that you may be tempted to press a button because it exists, make it a game option to diisable the pause button and set that option to disabled by default. Then I will happily enable the pause button and play the way I like, and you go on playing the way you like without a pause button.