Thank you!

This request has been added to the tracker:
https://winscp.net/tracker/1910
You can vote for it there.

It was my intention to ask if it would be easily implementable to allow the user to decide which sides the trees would be on, haha. :P

Because it's not implemented? :)

Uh, seriously? If so, why not? D:

No it's not possible.

Is it possible to have an option to move the remote tree to so it's to the right of the remote files panel?