Yes, I wrote a Macro for 3 or more...but it doesn't work well on one or 2, and we need a simple menu item.OMG--just read RickO's post--exactly--Keyboard Maestro macro--we can share (i.e., I can too).
Here is a quicker way to do it in Quicken for Mac 2017. This will save you a couple clicks. When you see that blue dot to the left of the transaction just click on the blue dot. You will have option to just click "reviewed" - or to solve your second question - you can click "Mark all downloaded transactions as reviewed". Hope this helps.