Fusion360 and NPower (developers of Cybor3d, Powersurfacing etc) allow for edge weighting which may not be exactly the same effect but it does give some control over the rounding effect typically seen with subdivision.

I have not played with Rhino WIP 7.0 but McNeel has been moving toward integrating subdivision modeling. Not sure if there is a function similar to edge weighting in there now though?

Thanks everyone for the replies :D
Actually I was first surprised by F360 behavior at corners, as indeed it's not what you would expect from subdivided polys, then I found it really useful and time saving in my workflow, so I was a little disappointed to not have that in this new MOI feature. So I guess I'll have to hope the clamped down option will be implemented some day ;)
Thanks for this amazing program Michael!

Hi marc, so for the next MoI v4 beta there will be an additional option under Options > Import/Export > SubD import options > "Open boundaries: Keep corners" or "Open boundaries: Rounded".

The default will be "Keep corners" since that seems to be more common than I had thought and it also actually makes a simpler result too. But you'll be able to set it to Open boundaries: Rounded which will then give the current version behavior.

- Michael

Hi Michael, thanks so much for this. It is really cool that you take it into consideration like that. :D

Hi Michael, I've just installed the latest beta, and I'm really grateful you implemented the option like you said, I can now skip Fusion 360 entirely, thanks again for this ! :D