Hey some of them things are interstate capable.
I guess for me it depends on the situation, not the model of bike or even the type.
I will wave at scooters, they might not be bikers but it is still 2 motorized wheels.
Now if I am threading traffic, I dont usually wave, unless I have a small clear spot. Or if I am going around a corner or way on the right hand side of multi-lane road. I need my hands or they would not see me anyways.