I recently started playing Stronghold Crusader HD (sometimes Extreme) and i wanted to ask you fellas a few questions:

When i have 40 engineers selected and i want them to make 20 catapults, i need to mouse-click the catapult icon 20 times and then click a location 20 times…
Is there any faster way of doing this, like a hotkey/keybind or a shortcut for the “build catapult” icon?

Is there a way to quickly resupply multiple catapults with rocks?
When i select my 5 catapults and click the “stone to rock” resupply button nothing happens… even though i have over 300 stone on my stockpile.
But when i resupply one by one catapult (individually) it works normally.

I am having trouble making Ladderman and Siege Towers actually “dock” with any enemy wall.
No matter what kind of a wall i try to click both the Ladderman and the Siege Towers display that red “cross” icon, like i am doing something incorrectly.
Are there some types of walls that Ladderman and Siege Towers can not “dock” with, or some rules that prevent them from working properly?

Thank you for reading and helping me out :)