I know Zep has said the API is pretty much finalised so I'm guessing he's not planning on adding characters to the font but I think it'd be nice for the purpose of displaying controls/tutorials to have symbols to represent the start button (for posting carts to BBS) and the return key (for posting elsewhere where people aren't familiar with PICO-8 controls).

I made a quick mock up for them sticking to the 7x5 limit other glyphs use.

that pause glyph looks great! can't say I've ever needed to represent that onscreen, but if I ever needed to, I'd be hard pressed to come up with anything better than that

I mean I was just copying the existing button glyphs and when you only have a 3x3 space of pixels to work with inside the button icon there seemed like only one reasonable way to draw a pause symbol.

indeed!