Not currently, the parameters were added to the list so people could tell different versions of the same function apart in the list. If you are searching for class member functions you could try putting a dot, and then the start of the function name.
I have put in a feature request for an option to turn off the parameters.
HKEY_CURRENT_USER\\Software\\Whole Tomato\\Visual Assist X\\VANet8 [REG_BINARY] DisplayParamsInMethodsList = 01 (default - show parameters in Alt+M list) Set to 00 to omit parameters from the list.