Long press => Open a full screen modal (= no distraction) => Plenty of space to show every option and add a bit of text to explain the different modalities.
Popups are nice but sometie a plain new windows is a cleaner approach.
Discussion
But is it still a zap if it opens a screen?
Like, i will be adding a lightning wallet just to avoid going to the wallet and back. It's too much friction.
Good question. I think so.
Indeed you have to open the wallet too.
I think a Zap as "LN on Nostr", so it haven't to be necessary faster that a LN payment; of course a full integrated experience would be great and make sense for easy tipping.
However I review my ownn suggestion: long press (as security measure) for zap with the default value (future proof, it will work well with an build in wallet too), press to open the full options window.