T.S.
My older son (3) wants me to put him to bed most of the time, too. He's kinda a Mama's Boy for certain things, but needs Dad for others. Really, what we've done for a long time with him is to ask him who he wants to do something with (when it's not a big deal). We ask him every night who he wants to brush teeth with, read books with, etc. That way, we feel that we are giving him some control of the situation and I think he likes that.
What I have found to help Jacob get used to Dad for bedtime is me being gone. Both DH and I think it's important for us to have some adult time with our friends/family alone. I play softball one night a week and usually go to dinner with someone like 2-3 times a month. If you have to, maybe you can run some errands right before bedtime and not be around. Have Dad find a special book that only HE reads or have Dad sing a song that only HE sing..whatever. Just so that Dad's time is unique and fun. Eventually, your son will be ok with it.
But, really, there are just certain things that I'm preferred for (bedtime is one of them) and other things that our son wants Dad for (playing baseball!).
Good luck.
T.