Short answer: yes. Slightly longer answer: many worm composters prefer to avoid adding leaves because they often have other bugs and things that can be a bit annoying indoors. In somewhat rare cases, leaves may have 'invasive species' that outcompete the compost worms and throw the worm bins off. (Note: I'm not using the term invasive species in any technical sense of invasive in an environmental/ecological sense here - just simply the worms may get overwhelmed).

Most simple answer: if you want to experiment, add a bit at a time and see how it works. Increase a bit at a time. Think of leaves as a slightly more complex form of bedding rather than 'food', that probably still needs to be mixed with other bedding.

That said: the advantage of a worm bin is ability of worms to consume wetter and greener stuff, like household scraps, in relatively small spaces (bins). Leaves will break down pretty readily or be neutral mulch outdoors in the yard, especially if chopped well. My own preference would just be to leave them in the yard somewhere and run over them with a lawnmower from time to time and use them as mulch or let them decompose in situ, but to each their own, it might make sense in your case. You could even 'seed' leaf piles with some worms and let them do their work there.

Mileage will vary depending on the type and amount of leaves, climate, etc. Nothing wrong with experimenting some to see what works for you.

Thank you so much for your help. I'll use the manure, mushroom compost, peat moss and food scraps I already have and use the leaves as mulch in the garden.

Next question: I'm using a 2 bin system with the bottom bin for the worm "juice". I've put holes in the top lid for the top bin. Do I need to put holes in the side of the top bin for more air, or will the holes in the lid be enough?

That's more a question of whether the lid keeps too much water in the bin (water evaporating will tend to condense on the lid and drip back down) and/or lets too many bugs in and out, especially fruit flies. I personally have had more luck with keeping a thickish layer - 2 or 3 inches, even more - of shredded paper or cardboard on top, and dispensing with the lid entirely. Seems to let enough air in and out, buffer (absorb/release) moisture, absorb smells if the stuff below is in good shape, and a good barrier for bugs. You could do both, and leave the lid on or off depending on how things seem to be going. I'd prefer more loose bedding on top instead of holes in the side, but whatever works for you. Obviously the disadvantage of holes in the side is you can't really go back once you've done them.

I've got shredded paper from work. It's paper from our printers. I read online that this paper may have toxic elements to the worms. Is that right?

I understand not toxic and amounts so small that not an issue, but not an expert. I have used and never seen any issues, but who knows? (Note I have heard the toner dust can be unpleasant and bad if breathed in, but that's a different issue than whether a problem for your worms.)

@napapen, thanks, and cool. Are your bins indoors or outdoors? Sounds like your climate more hospitable than mine )).

My bins are all outside, Napa valley does freeze but not badly. When it does, the worms go to the middle. 4 of my bins - large are sunk into the garden bed itself. I wanted to copy African Key hole worm composting. There are holes so the worms can go back and forth in the bins and take compost with them. I usually clean one of the bins each year and it takes time to clean the compost to the point it is like soil. I store it and use it exclusively on my plants - both in containers and in the soil. I have been teaching worm composting for 24 years in the Napa Valley for city and county and to Master Gardeners. Remember Worms Rule!!!!

Thanks, @napapen. I have also had plenty of worms outside in much colder temperatures, they all come back when it warms up. But they are also big piles for them to 'go to ground' or whatever it is they do. That said, they don't do much active composting when it's cold.

I was mostly (in this case) thinking about the concern some have about e.g. introducing other bugs or whatever for indoor bins by adding leaves - no sense worrying about that for outdoor bins. I honestly don't know how much of an issue; I've never bothered adding leaves to indoor bins (space for compostable materials at more of a premium than any other concern).

even when I had bins in the garage, sow and pill bugs always found their way in. I read in a UC publication that the manure of sow and pill bugs is just as nutritious as worm poo so I just leave them alone. In my outside bins, I have small toads all the time, lizards from time to time, and small snakes. I just leave them all alone.