As a hiring committee member at an R1 school, I have never seen a candidate include ideas for REU projects as part of a job application, so I can definitely say that this is not expected and it won't hurt you not to have it. I can also say that there's an order of magnitude larger number of liberal-arts colleges in the US than there are REU programs, so it's hard to imagine that most places will have in mind that you're going to run REU programs while you're there. In other words: I don't think you need to feel this is a necessary part of your job application.

THAT SAID:

If you have mentored undergrads in research projects, I would certainly talk about this in your application; any school, from LAC to R1, will be happy to hear that you have some experience in this domain. But if you've never done it before, I can't see that there would be much benefit to saying that you have ideas about doing it. Exception: if you're applying to schools that you KNOW have REUs, and if you think that's something you'd like to be involved in, I would certainly say so in your application. Running one is a huge amount of work (or so it seems from watching my colleagues; I haven't done it) and extra hands on deck are always welcome.