Build in option the change to 200 posts limit?

I just used this plugin to “clear” two custom fields of around 400 custom posts, worked like a charm.

However, I had to modify the 200 posts limit, by editing the plugins php file, as there seemed to be no way to either change the limit in the plugins settings, “page” through the posts, bulk editing 200 posts at a time.. Can that be, or am I missing something?

Best regards
Bjarne