Argument query possible for use in bind with command or colon?

[Matt Ford]

Hi All,

My screen ssh wrapper doesn't work in some windows as I'm logged onto 
another system.  To sort this I'd like to bind the following and have 
the $HOST prompted for i.e.,

  bind s screen -t $HOST ssh $HOST

Is that possible?  Is it easier if we drop the need for substitution and 
pop up the ex like mode for further input.  For example I tried

  bind s colon screen ssh

hoping that might let me then type in the hostname.

Cheers,

Matt.