Number one isn't in my opinion, especially because you don't have legitimate routes for backs out of the backfield available to you on the hot route menu. So many people love to hot route their defenders so all your regular receivers are doubled, and I love taking advantage of this by throwing to a back up the field rather than on a screen or swing on occasion.
Number two sounds weird, if I'm reading you correctly. Snapping the ball while your receiver is in the C-G gap doesn't sound normal. IRL it would be near impossible to actually get through the mess without seriously disrupting the blocking scheme.
Number three is fine, I guess, but screens are so damned difficult to stop consistently even if you know they're coming and are manually trying to get out there and stop the back yourself. Anything that makes that play more effective sounds like a nightmare to me, but it's not like it's "cheese"--it's just another layer of annoyance
. Just my personal opinion on that one. We've played, and if you did it to me I wouldn't neg you for it.