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 not sure how much further you could go with army building without starting to offer unfair advantages.

Yea they don't want to get back to 7th edition formations with reams of special rules not on the units datasheets to remember.

I think they should be very careful about adding anything that creates more pre-game book keeping as 40k already has too much of this.
However, craftworld tactics will be fine as it is simpler to remember that if you see a yellow Eldar model on the table it gets an extra reroll per turn, or a purple and green one gets +1 range to all weapons etc.