BP Daily - Sidebar Format


I'm using the BP Daily theme. I just wonder how to change the format of the sidebar? Is it easy?

I'm using the standard widget "recent comments" - in the sidebar I think the the distance between the first and second comments are too big, also the distance between the line is too big too. And whether it is also possible to make like list, just like the one here with the small arrow, or maybe just a dot to make it more clear that there are several comments.

Second would the the authors widget. Can I make it into two coloumns in the sidebar?