Ok, so here's how I'm thinking single-click Zaps will work (*if enabled in your NostrGram settings*):

Disabled: Works as usual. Clicking the ⚡ icon opens up the zap pop-up.

Enabled: Clicking the ⚡ icon begins a 5 second countdown before the default amount is sent. If you click the icon again before the countdown finishes, it cancels the zap and opens up the Zap dialog.

That way no second icon is needed and it's easy to send a custom amount if you want to.

Thoughts?