I don't know which version of killdisk are you going to include in future ubcd versions, but if you are planning to keep the dos 4.1 version, I would like to point out that there are several "builds" with the same version number.
For example, downloading a file called killdisk.zip (about 11.4 MB), which includes a dos version numbered 4.1, the file is from 2007.
When downloading killdisk2.zip
and then go to "dos version only - download dos version (free) " )
you get a dos version 4.1 from 2009-May-02. Their hash numbers are different. If you check both killdisk.exe versions, they are both 4.1, but the build number is incremented.
I didn't ckeck all the other downloads (bootable disk creator for dos; and the dos+win suite version) to check which version and build number are included.
[update] The 5.X version includes the same 4.1 dos version inside killdisk2.zip with the same updated build number. So as a general rule, ubcd should be updated to the most updated build number of the 4.1 dos version. Moreover, the bootdisk.exe inside killdisk2.zip is the exact same floppy creator downloadable as a separate exe. [end of update]
After all, killdisk.exe, kd_real.exe and dos4gw.exe are "simple" dos programs (no special boot configuration except for ram availability), so their most updated version/build should be included in ubcd. AFAIK, the updated builds support all the previous supported hardware also.
So please update killdisk.exe and kd_real.exe if necessary. Thank you in advance.