Hmmm. No other replies to this.... I wonder if we're the only two left.
Anyway, as you mentioned suggestions for the new devs...
When you currently resize a window, it causes all other programs that have a window on screen to be blocked. To see for yourself:
open up an xterm and start glxgears, xine playing a movie or sound file with the visualiser window visible or even try something very basic like 'xclock -d -update 1'.
Now start to resize the xterm (or anything else for that matter) and you'll notice that the other programs are blocked until the mouse button is released.
Although I'd expect the application being resized to be blocked while the resize is actioned, it seems a little odd for it to affect all other running X apps too.
That's the only remaining niggle I have with Window Maker. It'd be nice to see this fixed, but it'll still remain my preferred window manager either way.
Gaz.