I guess I don't see the issue here. The formatting of a new disk in unRAID is determined by the setting in the Settings->Disk Settings, so there is not necessarily a standard format. unRAID also needs the signature that it creates when it formats, or a by running a script like preclear.
Formatting a disk with UD is not the way to add disks to the array. The format in UD is only to support disks used in UD. Why would someone format a disk in UD and then decide to add it to the array? If they wanted to keep the format, they would have to do a 'New Config' and that's another set of problems in the making.
UD uses parted to partition the disk and uses the '-a optimal' switch so the disk partition is created with starting sector at 64 it the disk is an Advanced Format disk.
From the parted manual:
"optimal
Use optimum alignment as given by the disk topology information. This aligns to a multiple of the physical block size in a way that guarantees optimal performance."
I'd rather favor disk performance than generically setting all disk partition sectors to start at 64 just so someone can stuff a UD formatted disk into the array.
EDIT: After thinking about this some more, why would unRAID not accept a disk formatted either way? The format is optimized for the disk, not unRAID. It affects the performance of the disk, not whether or not unRAID can accept the disk.