I know what you mean....I use the backspace key often too!

But there are times.... I have to face someone...like my husband.....and I need to get out the right words...watch the tone of my voice...etc. If I feel like I am going to say something purely out of anger I usually ask if I can think about things and get back with him later.
Sweet.

"It's never too late to be what you might have been". George Eliot