As far as I know, the VGA output provides exactly the same image as on the CRT. So a monochrome scope will output a monochrome image via VGA.
As for enabling options, the link provided above by walkerru3 to the info I posted on eevblog forum is everything you need to know.
According to the user manual here (page A-1):
You have the following options available:
1F - Floppy Disk Drive (Requires the floppy drive to be installed)
13 - RS-232/Centronics Hardcopy Interface (Requires the serial interface to be installed)
05 - Video Trigger (Requires the Video Trigger board to be installed)
2F - Advanced DSP Math (No prerequisites, can be software enables with no additional parts)
You can also try enabling option 2M and see if it works. Just reboot the scope and see if it shows up on the boot splash screen. If not, then disable it and try 1M instead, rinse and repeat.
Jared.
Jared Cabot