Re: Were these left out, or no?
So far, it's not really sounding like there's a real clear way to do either of these things. As far as I can tell, the ideas thus far, though not bad, don't really QUITE capture the main property of a contagious power - namely, the ability for a victim to pass it on to others.
As far as the object thing, it seems as though I may have been misunderstood. Specifically, while I understand an object can BE a power in Hero, the default assumption is that the object somehow functions as the power. For example, a gun is an RKA, magical winged boots are flight, and a suit of armor is..... well, armor. But what concerns me here is whether there's a way in the mechanics to specifically designate a power belongs to, and functions on, the object itself, not its user. For example, an item whose "flight" power reflects that the object ITSELF flies, not that it allows its user to. It comes to mind because BESM allows this, as well as variable discounts based on how useful it is. For instance, a hoverboard is still pretty useful, even if it doesn't confer the power of flight on its user. A gun with an inexplicable tendency to sprout wings, however, isn't useful at all.
EDIT: I'm an idiot. As it was sort of indirectly pointed out a few posts up, the Sticky modifier more or less does what I was looking for. It doesn't fully resolve the issue though. It doesn't persist beyond afflicting those who contact the original victim, for one. The other problem is it's touch range, but I suppose you can probably put an AOE modifier on the modifier to rectify that.