maritimo80
First Post
A mounted Ranger can use his natural explorer ability (ignores difficult natural terrain)? 
And one mounted rogue can use your cunning action?
				
			And one mounted rogue can use your cunning action?
			
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							Why?
You can control a mount only if it has been trained to accept a rider. Domesticated horses, donkeys, and similar creatures are assumed to have such training. The initiative of a controlled mount changes to match yours when you mount it. It moves as you direct it, and it has only three action options: Dash, Disengage, and Dodge. A controlled mount can move and act even on the turn that you mount it.
So a rogue could use its cunning action to dash while mounted, but it wouldn't increase the mount's speed at all.
The rest of your post seems sensible, but what does this even mean? Maybe my imagination is just lacking...