With the other editors I've tried, the only file that needed modification was the template for the edit.php page (usually templates/--theme--/edit.tpl). In most cases, all you had was a Javascript statement in the header of the page, and some way to identify the textarea field to be modified.

Some editors required modification of every single form input field - these were way complicated, and I usually didn't bother to spend a lot of time on them. However, the forms are generated in templates/form.tpl if you need to make a simple change, like putting in some code for each formatted text field.

form.tpl can get kind of complicated; essentially, however, all of the metadata for each Siteframe class is available, and you can use that to generate the form stuff.

In the siteframe.ini file there is a user_editor_enable option that's supposed to let the user choose a text editor. Does it work?

I messed with widgedit and fckEditor. They installed easily. Glen has some instructions around here someplace. The biggest problem you will run into is they usually do not work with Safari.

By the way, I prefer widgedit but I am waiting for the next release to see if the FF and Safari bugs are fixed. It's one of the less feature rich but it produces cleaner code and has everything I need.
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Here's a Flash one that works in all browsers: http://www.flashloaded.com/flashcomponents/flashtexteditor/

Never knew they had a Flash based editor out there. Looks like it has all kinds of features. I prefer to stay in the open source environ, but hey, it worked in Safari, so have to say cool. Luckily, I don't need one bad enough to pay for it so I'll wait for widgedit.