Hi, Jakob,
I made this change in Rhino 7 several months ago to eliminate options that confused some users and have SubDivide do what most users want most of the time. You are the first person to say the removed options were useful.
The removed V6 options were
SubDivisionCount = 1 or 2
Creases = Yes/No
Corners = Yes/No
DeleteInput=Yes/No
My understanding from reading this thread is that you are using SubDivide to edit an ordinary mesh object. (Input = mesh, output = mesh).
Of the 4 R6 options, which ones did you regularly use and why?
Can you post a V6 .3dm file with example input meshes in it along with the V6 SubDivide options you used on those input meshes?
This will help me get a better understanding of what to consider putting back into V7 and how to handle defaults and other UI considerations.
– Dale Lear