Yes, Bullet does not have the notion of dynamic versus static friction, but it is needed:
- Make an incline of 45 degrees.
- Walk up it (that work)
- Stop walking
- Watch you avatar slide
- Edit the incline, change friction to 0.9999
- Watch how that too does not work.\
Bullet, like PhysX has a physics frame callback. This is where code can be written to introduce adjustments like static friction.