Using expressions in value pins

From sugokuGENKI’s suggestions thread I learned that you can enter expressions into value pins. Didn’t want to derail that thread so I’ll ask some questions here instead.

Is this documented anywhere?

Seems like it’s the same expression parser doing the magic as in the Expr (Value) node is this correct?

Noticed you can use “pi” which of course makes me wonder if there are other constants available…

right, it is the same parser as used with the Expr (Value). should all be in its helppatch.