regarding the tell tale scabs, I would soak them and try to peel them off and get the plug out and treat topically with antibiotic...depending on what you find you will know what to do. The plug, even if tiny (and one of mine was tiny on the bottom but it went straight through the foot to a plug on the top!) often reveals a fleshy wound with some blood and pus...if you dont see a ribbon then youre set...but you may see the ribbon forming...I would do it because if its a plug then you can nip it in the bud and it will heal right away. if its just dirt or something it will wash away with the soak and you will know.
I dont see any calluses on my bird's feet. I let them roost on a shelf at night which is a drag because they poo up there, but every AM I just go through with a garden trowel and a dust pan and scrape it out and replace the pine shavings...so its always clean for them and they are not on a perch. They have different perches and a ladder, but they seen to prefer the shelf. They actually relax their feet and curl them in underneath themselves, which is sort of lovely....
I guess I love their feet so I noticed this early on the one hen...Im always photographing their feet and looking at them.
One season Karl lagerfield made a gold lifesized chicken foot that was a pendant, as part of his european line....I spent so long trying to get my hands on one, even though I suppose I could never afford it in that it was part of his couture line, and gold (which I don't wear) but it disappeared really quickly; and I think it was a play on voodoo or some such...anyway, I always thought that was the greatest piece of jewelry Id ever seen. And Ive had to give up wearing it at home because of parrots anyway!...it gets put on in the car and removed before the birds can get at it!;-)
I would definitely soak those tootsies and dig around a little...remember this is staph and to let it grow is to chance it getting into the bloodstream and killing the bird...and other birds getting it!
Wash your hands and change your work clothes alot....thats what Im doing!
melina