The short answer is no. Most aircraft do not tend to roll badly with rudder input while in a hover, even if they have signifigant roll coupling in level flight. And no, I can't explain that one.

Second, it depends on your plane in particular whether the rudder shape will cause it to roll with rudder input. There are several other factors that influence that, and your rudder's shape may actually be designed to negate that. Some other factors that influence roll coupling are wing placement (high, low, mid) dihedral, horizontal stab placement, verticle stab and rudder placement in relation to the datum line, as well as the rudder's geometric shape. By the way, what plane is it?