Tree expansion with keyboard

When I select a directory in the tree, it is automatically expanded. Is it possible to switch this off? I often use the arrow keys to move around the tree, but it is very hard to move down the tree if branches keep expanding – this moves the directory I'm trying to reach further away. Other apps with a tree (e.g. Windows Explorer) only expand if I press + or "right arrow".

I'm using WinSCP v4.2.8, but I've seen this on other previous versions.
I'm on Windows XP SP3.
The same behaviour occurs with Commander or Explorer style UI.

Thanks for your post. This request has been added to the tracker:
Bug 612 – Optional expanding of directory tree

Thanks. 8~)