Welcome to the forums!
Those are some interesting ideas. A lot of those have been suggested (like the cleanse ability) in various threads in the past from what I recall, but others like changing her flight to just use GA is certainly an idea I haven’t seen before. I would be curious as to see how that would turn out, but of course if something is being taken away from her kit as a nerf, she would need some form of compensation for it.
Mercy being able to rez while moving around and / or shooting is also an interesting concept. For me personally, a lot of these I wouldn’t mind trying out. If I was going to recommend any idea for Mercy’s kit overall, it would probably be the idea suggested in Titanium’s thread, as it seems to be the ideal design for Mercy’s kit that uses elements from her old resurrection, and adds new abilities like Pacify - explained in excruciating detail. It’s well worth a read, just my 2 cents though! 
~Sincerely Yours xoxo,
a Lover of True, Fair, and Fun Balance.
xavvypls 