...that can be included into future editions of UBCD?
UBCD, in its ubcd2usb scripts, can only make use of the tools already provided by the boot loader itself. It is, after all, just a script.
At this point, there is not much that UBCD can do. Currently, the closest we could go would be to modify the script so to support syslinux64.exe too. Yet, AFAIK, that would be for BIOS systems, not UEFI. I could be wrong (as I have not actually tested the originally BIOS-based 'syslinux64.exe' installer under a UEFI-based system).
Considering that most tools included in UBCD require (as in, "depend on") BIOS anyway, accommodating the specific needs of a UEFI-based script seems, at this time, not realistic. Potentially, this could change in the future.
If the only system available for a user is based on UEFI, I tend to think that, at this time, using alternative methods (such as those already-mentioned GUI tools) would be a more-realistic option for users, instead of waiting for an updated ubcd2usb script to support UEFI.