Boiled linseed oil has chemical dryers in it (not what I'd want in a conditioner) and lead (not what I'd want against my skin or my pet's skin.) I have both boiled linseed oil and plain at home: plain for food-grade polishes and boiled for furniture. Boiled linseed oil is quite the concoction so don't think you can just replace boiled with regular.
I hear beeswax and linseed make an awesome "boot rub" leather conditioner. I just bought some beeswax and have spend an hour failing to find a recipe ;-)