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Those types of knives can be sharpened easily using a paper wheel or a belt sander followed by some white compound on a leather belt. I did a few paring knives for a neighbor recently. You can't raise a bur on some of them freehand. And if you do sometimes it takes forever to remove.
I doubt it makes a meaningful difference. For my razors it's always edge leading for the finishing. For my edcs though I find edge trailing works at least as well as edge leading. I couldnt say yes but i wouldnt say no. Lol.