Well, a resolution (of sorts) on this issue.
Finding that the right-click (and sometimes general connectivity) continued to be a problem, I scheduled a visit yesterday with a Genius at the Apple Store I bought it at.
As luck would have it, when he brought my MacBook out of sleep, it could not find the MM. He did what usually ended up doing it that event (removing it from BT, then letting the BT Assistant 'find' it again) and was able to use all the clicks on the MM. I did explain it was intermittent however, even before we opened the MacBook...
But then he rebooted the MacBook and while it found the MM and he was able to right-click, he lost control over tracking. His opinion - the MM was buggered. Of he went to speak to his superiors - he came back and explained that as the store didn't have any BT MM in stock (to replace it with), this would have to become an AppleCare issue. So though I was sitting at the Genius Bar in an Apple Store, I would have to call AppleCare personally to arrange a replacement. Let's just say disbelief crossed my face....
He filed a report online for them (and for this he needed my MacBook's serial number, not the MM's) and I then called AppleCare. After working my way down thru the phone tree, I got to clerk who put me on hold twice for some time, only to eventually come back and take down my mailing info for he MM switch. Then she wanted my credit card.
"Sorry?", I said. Well, they'd courier me a new MM, but wanted my credit card to ensure I returned the broken one. They sell a duff product, and then want my credit card to fix the problem in warranty? What would I do with a broken bit of hardware? I told her that wasn't going to happen and suggested hat she send the MM to the Apple Store, where I would do the switch. No way, as far as Apple Care clerk was concerned ("Call back Monday and speak to Customer Service") so I hung up and asked to speak to the store's manager.
Explained the situation and he, to his credit, asked what I would like to do. At this point I was a little pissed off at the process, so I said a refund (this more than a month after purchase) and he agreed.
So, I 'm back to the trackpad and stupid keystroke/clicks.
And my opinion of Apple, the quality of their equipment and, most especially, Applecare has been tainted - again.
Didn't buy into AppleCare when I first bought the MacBook - thinking I'd have a year to make that call - and it seems that I may not now at this stage. I would think nothing of sending my computer to a repair facility (properly insured, of course), but if Apple wants my credit card to do warranty work, forget it.