Two years ago I did tape my fingers after getting knocks on my thumbs using a figure 8 pattern around the middle thumb knuckle. It is what boxers do to protect their thumbs in case they catch their thumb when punching.
Last season I was either lucky, my gloves were better or my technique was and I didn't get any knocks at all.
In the past I have also tried padded tape above and below vulnerable joints but like most people it was after the horse had bolted. It seemed to help protect the joints fairly well as long as you don't do it too tight and lose the feeling in your fingers it is worth playing around with, see what you like. On the other hand a physio once told me that tape is 99% psychological.