You'll want the ∞ to appear when the WHEN I AM [CLICKED v] menu input is changed to PRESSED, if I'm understanding that distinction correctly. I would go further and change the block title text to WHILE I AM, because I think this distinction is non-obvious enough that users will need some redundancy in the labelling to figure it out. For the same reason I support the generic WHILE block, and would even make it primitive, so users see them one below the other right from the start. And I would add redundancy to their names, making them WHILE < > TRUE and WHEN < > HAPPENS.
It'd be nice if the "rule" menu item were called "rule ∞."
It wouldn't be so bad also to turn the block brown, borrowing that color from Scratch, for events, keeping rules orange/yellow. (People disagree on what to call that color.) But if you go along with changing the names, that may not be necessary or helpful.
It wouldn't kill me if that ∞ icon were a little smaller and thinner, by the way. It's really aggressive.