Multi Events registration with discount

[developer]

Hi all,

I'm trying to implement multi event registration. for this i'm trying to use Civi cart checkout, but when user is going to checkout screen profile fields are not auto populating( basic name and address profile is included in my event configuration), I'm logged in user and still profile data is not coming up in check out screen.
is it Civi's general behaviour or am I missing some thing here.??

I'm trying to implement discounts based on number of multiple events user is registering for, can anyone please point me on how I can achieve this.

I tried Discounts extension provided by community, it is working fine for single online event registration, can any one please guide me on how to get it work for multiple events registration at a time??

->I'm trying this on Joomla 2.5.18 and Civi 4.4.4

Many Thanks