Hi there.
While the tree view as a very nice addition to mIRC 6.2, I was rather frustrated at the fact that it would not dock to the top or bottom of the screen area, only the left or right. I dabble in coding, but I could not find a way to accomplish this via mIRCscript. So I waited to see if these anchors would be added in 6.21; they were not, so... Here's the formal request.
If I missed something horribly obvious, apologies in advance.

Do you really think that it will very intelligent to have treebar on the top ?
Because on the bottom, by design, you won't see anything

By it's nature the treebar is a vertical design, so unless you want the text to be rotated 90° (which I'd imagine would be very hard to read) I don't see how it would be at all useful.

Maybe you've got some other idea of how it would work?

The switchbar can be extended into multiple lines. I was assuming a similar setting could be put into place for the treebar, and the remainder of it could be pulled about by means of a scrollbar.

A two-line switchbar would roughly translate to four entries in a treebar, since the spacing between items is more narrow.

I am not sure even what this treebar is? How do I bring it up?

View > Treebar

And a horizontal treebar could be done by vertically stacking channels/windows like stairs and connecting the lines to the 'steps' and with a scrollbar to the left. However, I seriously doubt it'd be pretty.