As the title says: allow words to be striked through. It adds a fun bit of RP to what are supposed to be hand-written letters.
Is that really not available? Hm, I thought I'd enabled that in the rich-text editor.
Could you please report this as a bug on the bugtracker (http://bugs.battlemaster.org)? It's not really a feature request, as I thought it should already be available.
I opened an issue for it on the Bugtracker. I tried using the HTML from the help page of the CKEditor, but that didn't work either. I guess it just needs to be enabled.