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To be honest, I didn't know many of the tricks you mentioned, which is strange, considering I've been playing for a long time.
Here's one I remember: how to deliver a week's worth of troops to a hero who is several days away from the castle. You create a chain of heroes from the main hero (who needs to receive the army) to the castle, so that the distance between each hero in the chain is exactly one day. Then, one hero from the castle takes, say, a week's worth of troops, runs to the next hero in the chain, the second runs and gives it to the third, and so on. As a result, the main hero receives the army from the castle in one day. Of course, it takes a long time to set up, but it helped me once, and it helped a lot.
Another one I remember is how, in tactical mode before a battle, playing as the Stronghold, you can use cyclops to bombard the walls. You start selecting units in a second loop, reach the cyclops, and throw it at the wall again and again. To be honest, I didn't use this, but I read about it. It's quite amusing.