Assuming you mean an animation other than the walk animation you could add a condition to the mirror event 'walk animation is playing', so it only mirrors when you're walking and won't do it if it's playing another animation like an attack.
'Set position' can be used. If you need something more specific please explain as I've not played that game.
Did you put the scroll to behaviour on something other than the character?
By picking, and the condition 'mouse cursor is over object' should be enough to pick that one instance of the object. If you already have that event and it's not working please share a screenshot of the events.
Check in debug play, select the sprite object and see what animation is actually playing. Should play the correct one if only one key is pressed. If both A and D are pressed at the same time there might be an issue.
Nothing obviously wrong, maybe the animation name is wrong? By the way you don't really need a variable you could move the simulate actions to the key press event.
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Yes no problem (x,y) in this case is the range. Check out the manual for more info!
random(5,10) or round(random(5,10)) if it needs to be an integer
Jump strength on the platform behaviour. In events you choose the object and set jump strength.
Member since 5 Aug, 2013