For the tyre question, i always run my rear tyre backwards, because in theory it should increase your grip, hence the reason TryAll tyres have the tread pattern pointing the opposite way to the direction of the tyre.
As for the freewheel, take it apart and clean all of the grease out of it.
Put the pawls and springs back into place and slightly bend the spring out wards.
Lightly grease up the ball bearings and then reassemble the freewheel and that should sort the problems.
I think he means this stuff?