My b2evolution Version: Not Entered

Hello guys. I'm using b2evo for a little time now as i'm creating a site for me.
you can see it at miojo.net. (miojo, in brazil, is lamen =P)
Well, my question is: there's a widget that shows recent comments and you can choose from witch blog you would like to get the comments. But how do i select to show recent comments from all blogs together?
what i did was something like a portal, with 4 blogs with different subjects. but they're all mine. and i wanted to put in the principal this "all recent comments" without having to activate 4 diferent widgets. is there a way?
thanks!