You candead head any rhododendron/azalea if you have the time and the patience. I don't because I have neither...

Many evergreen Azaleas look best sheared like an informal hedge right after blooming. Sometimes, they will accept a second shearing right after the beginning of July, but they will need time to form new flower buds before fall. Usually, after shearing, each of the new twig tips will form a flower cluster.