We've covered this - it doesn't matter, we're assuming electricity that is not paid for by the OP.

Grabbing a driver for the card and guiminer takes all of 15 minutes. This is irrelevant.

An Intel card that cannot mine - perhaps you could argue that a >3MH/s miner isn't "OK" - anything else is fair game.
I guess - not more so than any other use would, though.

To cut this short, it's perfectly fine to mine with a shitty card - "not okay" means that you cannot, in my eyes.

Why does it matter? I fail to understand your contention.

It doesn't matter whether or not it will pay for the electricity needed - that isn't what I'm saying.

I'm not going to argue morality and whether or not you should waste resources for your own personal gain, etc. etc. - what I'm saying is, it's perfectly acceptable to mine with the OP's card at 27 MH/s if the OP is trying to acquire BTC at any rate at all, without regard for his or his parents or his neighbor's or whomever's electricity bill.

To start, you're arguing over less than a penny's worth of BTC. That is to say, you're wasting your time.

It seems like "credited" would be accumulated BTC that has been paid out, not accumulated BTC that is held in your account after accepted shares are paid for.

What's wrong with 27 MH/s?

This is only true if you personally pay for your electricity.

Is it "OK"? Sure, go for it, you won't break anything.
Is it optimal? Not even close.

I've personally had problems with multiple cards registering hashes under a single worker name - I suggest opening an individual client for each card, and as such registering a separate worker for each card.

As fascistmuffin said, this also comes with being able to spot problems much more quickly than if you shove as much as you can onto a single profile.