When you hit reply and scroll down through the previous comments below the reply there is an "insert quote" under the time/date stamp for each post. I just use that for multiple quotes.
Now wait, what? I'm missing something here.
Although it needs pointed out I have no problem, no problem at all, inserting quotes.
What
I do when posting an original topic or a comment, I just click that icon on the second row, second from the right, in that array of choices given above the space where one writes the reply.
And then I copy-and-paste what I want quoted, in between the ][.
Easy as strawberries-and-cream, and even if it's the wrong way, it obviously hasn't slown me down any.