There's nothing strange with "missing" updates.
Most likely there have been versions 1,07, 1,08 and 1,09 but not for publishing just for the software developers.
This happens all the time with other software as well.
If there is a version 1,10 and they say it is not for the america's it probably means that there might be some utilities that contain wrong information for the 110 volts versions. I am just guessing here, but this could be one of the possibilities.
Ofcourse it also could be that Roland usa doesn't know about it yet.
As long as they don't know about it yet, they won't guarantuee it.
Which makes sense.

I estimate though that Roland Benelux would say (If they did'nt know about it yet) "let me cheque which is the latest version and I call you back"
Which is a different approach between european way and american way.