At this point I think you are asking too much of how screen parses command line and would be better served by shell scripts around screen instead.

There is nothing stopping shell script from generating a temporary screenrc file.
And running screen with it.

I'm even surprised that you can create executable screenrc and that it works ;)

I would try something like this:

#!/bin/sh

TEMP=$(mktemp /tmp/generated-screenrc.XXXXXXXX)
echo "focus right" >> ${TEMP}
echo "screen -t \"Director Process\""
echo "exec ... ./bin/director ${1} localhost"

screen -c${TEMP}

If I put this at the top of a "screenrc" file

     #!/usr/bin/screen -c

and mark the file executable

     -rwxr-xr-x 1 cponder dip 1094 Jan 18 20:19 screenrc

I can actually run it as a command and use the screenrc programming convention to open windows and execute commands in them.
What I'd like to do, though, is also pass a parameter to this script on the command-line, like

     ./screen config.1.xml

and be able to use it inside the file, like

     focus right
     screen -t "Director Process"
     exec ... ./bin/director $1 localhost

so the command-line parameter gets expanded on the 3rd line above.