Filters for page / post metaboxes

Hi, please ignore if you are not a coder.

I waht to put a checkbox on an post/page admin meta box. I don't want to create a separate metabox, as it is only a small option. There is a filter 'admin_post_thumbnail_html' available for the html on the featured image metabox, however there is a technical issue in that the featured image refresh on add/delete of an image destroys the post data making adding decent post based logic seemingly impossible.

So my question is, does anyone know of other filters to other other standard post / page admin meta boxes that I could try and use. I could search the Wordpress code, but thought I'd ask first.

Alan