'Get channel modes that require parameters for correct parsing.
@rtype: C{[str, str]}
@return C{[add, remove]}'

def getChannelModeParams(self):

    params = ['', '']
    prefixes = self.supported.getFeature('PREFIX', {})
    params[0] = params[1] = ''.join(prefixes.keys())
    chanmodes = self.supported.getFeature('CHANMODES')
    if (chanmodes is not None):
        params[0] += chanmodes.get('addressModes', '')
        params[0] += chanmodes.get('param', '')
        params[1] = params[0]
        params[0] += chanmodes.get('setParam', '')
    return params
