With the distance kernel one can use any of the following distance metrics: 
BrayCurtisDistance()
CanberraMetric()
CanberraWordDistance()
ChebyshewMetric()
ChiSquareDistance()
CosineDistance()
Distance()
EuclidianDistance()
GeodesicMetric()
HammingWordDistance()
JensenMetric()
ManhattanMetric()
ManhattanWordDistance()
MinkowskiMetric()
RealDistance()
SimpleDistance()
SparseDistance()
SparseEuclidianDistance()
StringDistance()
TanimotoDistance()

