OpenType OS/2 Table Fields

Are all keys(Properrty) of UFO3 supported?

How can I set StrikeoutSize, StrikeoutPosition, SubscriptXSize…

Custom Parameters?
They are all in gray color and not exported.

These are not supported because MakeOTF ignores them. If you really want to set these values, you can change them with OTMaster in the OTF. But what for? Please correct me if I am wrong, but to my knowledge, there is no application that makes use of the value.

Thank you for your quick reply. I just want to know how to do it. No problem