[syslinux] Request for built-in DOS launch module

[Alexander Perlis]

To make say a BIOS flash tool available over PXE, my impression is that 
a typical procedure goes like this: modify a generic FreeDOS 1440K disk 
image to contain the EXE and change the AUTOEXEC.BAT to launch that EXE, 
then make the 1440K IMG available on the PXE server. But more recent 
BIOS flash EXE are too large and won't fit on the 1440K, not even 3840K, 
so now we have to look into making a custom FreeDOS ISO image or FreeDOS 
USB stick image or FreeDOS HD image, for which recipes don't seem to be 
readily available. In a changing enterprise environment involving many 
different computer models, you find yourself over time trying to recall 
and repeat these fragile steps of trying to prepare FreeDOS autoexec 
images...

Perhaps there is already a better way available? But if not, it would be 
wonderful if SYSLINUX had a built-in module that automagically 
accomplishes all of the tediousness described above, e.g.:

LABEL biosflash
KERNEL doslaunch.c32
INITRD flashtool.exe or files.zip or files.tar.gz
APPEND exec=flashtool.exe

I would imagine this would do something along the following lines: set 
up a DOS-like environment with an extra drive letter for a growable 
ramdisk, copy the INITRD file or archive (unpacking as necessary) into 
that ramdisk, switching to the ramdisk drive letter, and then launching 
whatever file is listed in the exec parameter.

Does something like that already exist?

Alex