Rings with default and limited inputs in custom blocks

Help with Snap! Snap! Editor
1

script pic (7)

Is it possible to make it with custom block?

2

Not as far I know

3

No, it is not yet possible.
I think it might come in f future update, but I can't find the forum post about it.

4

You can of course do

untitled script pic
untitled script pic1304×138 42.7 KB

but you can't do it outside the context of a (primitive) HOF call.