The vibration is attached to your profile so you would have to disable the vibration for your profile, and that would disable the vibration for *everything*.

Profiles in the N900 are not very good.

The other solution is that I code it, and add options to enable/disable vibration in Yappari and customization of the vibration/LED patterns.

I could do it after the client is ready (after it does everything an original Whatsapp client does). That's like a year from now