I was wondering if I could change the default apps on the lockscreen and since I haven't read something about it, If anyone knows I would be glad to inform me.
AFAIK no one yet management to change apps but I'm sure smarter people than me could easily manage to change them. One thing I've noticed is that all apps that can be opened from lock screen have permission to draw over other apps. So keep this is mind of you are going to try something.