Whilst this game is very logical, sometimes the specialist abilities can get confusing.

A (single player) 'Sandbox' mode where you can spawn whatever you want, wherever you want, then assign them teams and get them to attack each other would be a great learning tool.

Any time you go 'I wonder what happens when...' could be put to the test immediately.

I think this is a great idea

I've already suggested the idea here...
viewtopic.php?f=5&t=783

Agreed, this should be a must have item. Like the tactical puzzles.