Airmail Watch notifications should match those of Apple Mail
Coming from the default Apple Mail app, there's a distinct Watch vibration of two quick, light pulses when an email comes in. Airmail's vibration is a long, heavy vibration that nearly every other app uses.
Airmail for Watch should either use the two quick pulses, or have a customizable pulse.
There should also be an option for choosing sound notification only for VIP mails just as the native mail app