there has some empty space beside update info option..

I don't think it is issue but there is no enough space in mobile to show sidebar, regarding email ids the component uses free hangout API. You should be able to adjust as per your need.

as well as make compulsory gmail ids while registration if users entered disposable email so wants to block registration process. and wants to avaleble privacy option same like wall posts. public, friends and disable all for hangout component. Thanks.

Now on PC version hangout option visibal but on mobile version not visibal. second thing its not connecting to other users directly once u click on start hangout. you have to invite people again. if u click on start hangout wants to strat call directly with this user then its good. i mean component wants to recognize the users email and once we hit the start hangout wants to start call directy. and dont wants to visible start hangout option in our profile for ourself. make it visibal only for other users. if it is possible make these changes. Thanks.