Hi Karsten,

<<which effect has the Corners Option>>

Its the same as "preserve corners" script checkbox, allowing subdivision of 2d shapes:

Ideally, the "Corners" option would have a 2 state pulldown with choice between "preserve/ignore" (maybe it would better to simply be "preserve Crn: Yes/No"

I have attached my "max_Subdiv_beta9.js" with the changes outlined in my last post.
It works for inputting into fields on info side panel, but the node itself can not be wired into.

Hope this makes sense
James

P.s. In the .nod file it is necessary to input "1" into "Corners" field because it reverts to "0" on reopening.