Notification sounds and alternate apps

[Dush Ku]

Hi, in windows phone you could set sms notification tones to your own custom sound. is there a way to do that in android? or is it just Samsung galaxy phone that blocks that?

Also, is there any messaging app that works like windows phone did where you tap on the home screen icon and it always takes you to the main app window instead of the last message thread you were in?

 

[Dush Ku]

double posted for some reason, not sure how to delete this