ORIGINAL: MT
I thought this problem was just me, it was driving me nuts! I started noticing others must have had the same problem as no one edits their quotes for needless content.
This problem should be a priority, as people can't highlight needless text and pics when quoting, they have to backspace all they way through it. [:'(]
MT,
If you left click and drag on the last letter of the text you want to highlight, hold down the Shift key and then left click and drag the first letter of the first word to highlight that still works. This is how I did the edit on your quote. Not as easy as just draging across the text but it beats doing the back space thing.