Do they say FAT32 only?

The US site, draytek.com has much more info on this. It does indeed say only FAT32 there and also that having an extended partition rather than primary causes reboot cycle. Not sure why that info wasn't on the UK site documents, not that I could find anyway.

It is a shame no NTFS but it is still a handy feature to have, even if not ideal in a business environment.

Its an interesting question, why is the UK information lacking?

Even though this is a fairly consistent theme - the US site for Fujitsu-Siemens is so much better than the UK equivalent. You can order a properly customised machine from the US site whereas the UK one provides next to no alternatives.
Its almost like the UK suffers from some sort of protectionism at the manufacturer level.