OK, with help from the plugin authors, I figured this out if anyone is interested.
By default, my write area opens in advanced mode with a wysiwyg plugin (WYSI-Wordpress). I have the SpellingChecker plugin installed, which doesn't work with wysiwyg (but the button was still there). Also, the Quicktags buttons were visible, but they didn't work. And since I use Firefox, copy and paste also didn't work. The only way to use the spellcheck plugin and quicktags, and to copy and paste with a Mozilla browser, was to de-activate the wysiwyg plugin in the Plugin area (and then re-activate it when you were through with those tasks). This just seemed way too cumbersome.
The idea was to create "on/off switch buttons", since when using wysiwyg, I didn't want the spelling button or the Quicktags buttons to appear, as they didn't work. By turning off wysiwyg, the buttons would re-appear, and I could access their functions, as well as copy and paste with Mozilla browsers, and then turn wysiwyg back on to continue with the post. And ideally, incorporate everything into just one set of on/off buttons.
I now have a single set of on/off buttons.
Turns WYSI-Wordpress on
Turns SpellingChecker off (no spell button)
Turns Quicktags off (no buttons)
Turns WYSI-Wordpress off
Turns SpellingChecker on (spell button appears and works)
Turns Quicktags on (buttons appear and work)
Allows copy and paste in Mozilla browsers
Hope someone might find this useful... code is at: