Aiming, the process of adding your perception dots to your shooting pool, is a slow process. I would not allow someone to aim if they were doing any other actions of significance. The whole point of that action is focusing yourself over multiple rounds.
Moving, in world of darkness, is free - up to a point. I don't think it's considered an action in the RAW, and so shouldn't impact this at all.
Speaking - another action that doesn't require a roll - is a thing you can do for free as well, to a point (I forget if this is RAW, or simply a house rule every ST I've ever known in twenty years has used, the amount of words you can use varies from ST to ST). Obviously you're not going to orate in a combat round, but unless your mouth is full or whatever, barking commands shouldn't interfere terribly with much, either.
Reloading - in the age of W:WW - is a fairly complex affair. There's no roll because it's simple to do, but time consuming. To hustle it up, or do it while multitasking, I'd ask for a Firearms roll, either Dex+Firearms if their actions are primarily physical in nature (reloading while brawling/dodging), or Wits+Firearms if they're reloading and the actions mostly require their focus. Maybe Strength+Firearms if their grappling and trying to load a gun (what?). In a more modern setting with detachable magazines, reloading is much easier to do under pressure and I'd make a judgement, as an ST, on a case-by-case basis.
Werewolf gifts without pools to split, it is my understanding, come under two types "simply decides to turn on or off at will" and "passively on." Smell of Man, for example, says that it's on/off at will. Things like this are simple enough that they don't need an 'action' per se, like uttering a single word, it's simply a thing a Garou can do without putting too much into it. Stuff that's passively on is also not an action, but I'm assuming you're mostly focused on the first type.