unfocused floating windows

Hi,
I'm running ion-3-20081002 on my tablet and I would like to use one 
of those programs that emulate a keyboard end recognize the 
handwriting. Cellwriter (http://risujin.org/cellwriter/) looks like the 
kind of program I'd like. There is a problem: once the text has been 
recognized I must press a button to send it to the focused window and 
of course with the sloppy focus model the windows is never the one I'd 
like to but cellwriter's one.
My question is, is it possible to force a 
window not to have focus even if the pointer is on it (something 
similar to what happens to the rest of the windows when the scratchpad 
is visible)?
If so is it a winprop? 
Etn40ff