Is there any way to CLS a single line of output? I don\'t believe there are any switches for CLS, so maybe a better question would be:
Try ANSI sequences: http://www.robvanderwoude.com/ansi.php
Burrowing down the links, http://batch.xoo.it/t2238-BG-exe-Utility-for-Batch-Games.htm looks the most promising.
This page sounds like it has useful discussion on controlling/setting console sizes (and other display and buffer size settings). http://www.pcreview.co.uk/forums/change-buffer-size-console-window-can-runas-inherit-console-props-t1468842.html