You can
Click on send payment, then choose "Custom" on the left instead of "Quick Send"
Add as many addresses as you want
Thanks moni3z. I guess the only improvement that could be made now is the ability to select a bitcoin address from a drop down containing addresses from your address book.
If you start typing the name you saved in the address book it will come up as an option for payment address, but you'd have to remember all the names there's no list unless you open your address book in another tab and just cut+paste (could be error prone/double payment)
Thanks, I suppose that's the best it can be done