Just to clarify slightly -- you would like the mkfs.vfat in the SliTaz-provided dosfstools package to become a symlink to mkfsdos?

Which exist already? Will the existing mkfs.vfat have to be replaced?

root@slitaz:/home/tux# find / -name mkfs.vfat
root@slitaz:/home/tux# tazpkg list-files dosfstools

Installed files with : dosfstools
================================================================================
/sbin/dosfsck
/sbin/mkdosfs
================================================================================
2 files installed with dosfstools.

root@slitaz:/home/tux# 

Maybe slitaz provides mkfs.vfat in another package that i did not find?
In my Archlinux desktop mkfs.vfat is a link to mkdosfs.

To see if a package has a file,or all files contained in known package.
Search here: http://pkgs.slitaz.org/
There is no file mkfs.vfat in any tazpkg stable or cooking.
Most linux remove vfat because of microsoft patent trolls.
Ubuntu:

/sbin/mkfs.vfat---->mkdosfs

fat 12 or 16

mkdosfs  /dev/xxxx

fat 16

mkdosfs -F 16 /dev/xxxx

fat 32

mkdosfs -F 32 /dev/xxxx

thanks