I have a scotch pine that is perfect in every way except those long needles. can i cut those needles shorter?

I wouldn´t do that. There are other ways to get shorter needles.
Read here:

www.bonsai4me.com/AdvTech/ATPine%20Pruning%20Page2.html

Depends on the size age and maturity of the tree. If it is a young tree it wound be inappropriate treatment as the tree is growing. If the needles are two or more years old then they can be pulled off completely.. Not knowing more means that more advice is not possible, including the country you are in.