Basically from what i posted to a reply in the bugs section.
Seeing as you can move the treebar to the top and bottom of mIRC now, I noticed if you're on 2,3 or more networks it still lists them int he same way as it does if it's on the left or right, which to me is odd, as well as a waste of space to the right hand side of the treebar.
So my suggestion would be to list the servers from right to left when the treebar is top/bottom. IE:

Code:
+ server1       + server2    + server3       + server4
- #chan1        - #chan1     - #chan1        - #chan1
- #chan2        - #chan2     - #chan2        - #chan2    
- query1        - query1     - query1        - query1
- query1        - query1     - query2        - query2
- dcc chat1     - dcc chat1  - dcc chat1     - dcc chat1
- dcc chat2     - dcc chat2  - dcc chat2     - dcc chat2

and so on..