how to make a custom button?

this question was asked before, also with no response. is it a bad question?

Custom Buttom: not yet supported. Custom Buttom UI just for testing right now.

I will update if the Custom Buttom will be supported or not in the next version, because I think available buttons now enough for daily editing.

thanks. unfortunate.
i wanted to add pagebreak button for pager module. anyway to add that manually? i've tried to figure it out without success.

simple, just install excerpt module, you will see box for Teaser and Body.
Another way is click "HTML" button and insert your TAG manually.

thanks for the info on excerpt. but this is not the same at all.
the pager.module allows you to break a post into multiple (many) pages by adding <--pagebreak--> where you want a new page. and i am building the site for client who will not want to go into html.
so i need a simple way to add that tag into the html via a button.
thanks