I never need the rich text box for summaries - and in fact, as I want the "more ..." link to appear directly after the text, using the rich text box gives me trouble (as it automatically adds <p>-elements to the text which makes it very hard to impossible to add the "more ..." link directly after the last word of the text).
So, I'd like to have the basic text box as the default for summaries. I think ideally, this would be simply stored with the user-preferences, so when I change the editor, the module should remember this setting for the future. Alternatively (and even a little bit better) would be if I could change the default editor for summaries in the Main Settings.
Having to switch from the rich text editor to the basic text editor after it was loaded (which takes a lot of time) is a "workaround" but not really ideal (aside from the added load-time, this also gives me the trouble that I have to manually remove the <p> and </p> that the rich text editor implicitely adds when the text is opened in it).