No option to "expose as new graph input" for random seed?

Hi. Sorry if I'm missing something here, but I can "expose as new graph input" most parameters of nodes basically, but I don't seem to have the option to expose as new graph input for the random seed. Is there a way to do this that I am missing? I basically want to be able to change the random seed of multiple nodes at once. 

Thanks for any help on this, and sorry if this is obvious. 

Brian