It used to be accepted to use radials on one end and bias on the other to correct a severe understeer or oversteer condition. My problem with this is that radials grip so much better in wet conditions that it can lead to extremely dangerous handling when the road is wet. Probably OK for drag racing only but certainly not on the street.
I concur with not using a mix on the same axle. I had to use a bias spare to replace a radial on the rear once and the car was sideways on almost every corner unless I drove like a little old lady.