Component grounding

Yes. It’s the same ground as the chassis ground!

Then the question is, is this a good idea, or does it create a ground loop that can make the signal more subject to hum, not less?

Why do you feel you need additional grounding?

Generally speaking, modern components fall into one of two categories

• those with grounded power cords
• those without - i.e. two pin plugs 

For the latter, the chassis of the ungrounded components cannot be grounded and may "pickup" some EMI/RFI - therefore grounding eliminates this and may prove to be beneficial

Having said that, some components with a grounded power cable may not ground their chassis either, so they fall into the same category as ungrounded

So without testing each component its hard to tell which would benefit from additional grounding

Some people swear by chassis grounding - but I've never found it to be beneficial on any of my systems

But that's not to say it might be beneficial under certain conditions

Regards - Steve