A practice I have is to have a list of definitions in my theme/functions.php for things like post types, taxonomies, etc.. For example:
define ('PROJECT_TYPE', 'projects');

That way, if there’s any issue, I can quickly change the custom post type access name in one place. No problem. With Piklist, however, this doesn’t work. When making a metabox, for example, the post types are listed in the “Post Type” meta of the comments, and the values are taken literally.

It would be great to have a constant syntax, something like:
Post Type: {PROJECT_TYPE}, {ANOTHER_TYPE}

Thanks!