Can you add dvorak keyboard layout?
I have few off them

Any idea how to make it user-selectable?

syslinux allows you to load a new keyboard layout in the config file, but I can't think of a way to change it dynamically on user input..

May be you now how to add it to FreeDOS language menu (keybrd) ?

I also tried to make new freedos menu entry and add

there, not sure if it's right but thought to give it a try.
Anyway I didn't succeeded even in making iso bootable
used:

The following link list the dvorak layout (freedos):
http://www.ibiblio.org/pub/micro/pc-stuff/freedos/files/dos/keyb/kblayout/kpdos.htmhttp://www.ibiblio.org/pub/micro/pc-stuff/freedos/files/dos/keyb

For making a bootable iso, see the /ubcd/tools/ubcd2iso.bat file.

ok thanks for links. I managed to compile it now, but adding

neither in syslinux.cfg nor in isolinux.cfg does nothing

As for adding driver to freedos, I understand that keyboard.sys must be some how inserted into one of the cab files (witch one?) ? I couldn't figure out how

Here in this project they have menu then isolinux boots



may be you can integrate it too

This will add the layout only to the menu system (if you add the necessary keyboard files) (at least I think that it won't work in dos afterwards. I can be wrong).

You have to wait for as702 to add it. He has made the last updates of the freedos image.

System Rescue is a linux distribution. The "Loading keymaps" thing that you see there works only for linux. For dos you have something similar of course like in the freedos image (select something other than the default entry when you boot the freedos image).

You can try the danish layout for the moment (at least I found on a search someone with a dvorak keyboard which used the danish layout if dvorak wasn't available).