MiMB not meant to be a direct Meta Editor. It is meant to build XML files that are then exported to the meta format that Virindi Tank can use. Using this editor will allow you to create rules quickly, allowing you to get your bots working faster.
MiMB allows you to expand the program fullscreen. This allows you to see the entire rule. You are able to hightlight, copy and paste text easily. You can make rules in mass by simply clicking the create button (or pressing Enter) then going back and editing each rule for minor variations.