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.