Improved resource planning window usability

For us, this option is not very suitable: to form a selection of users for resource pools every time to actually view their workload once or twice for each new project will be inconvenient. It would be much more convenient to checkboxes in the list of resources.
Well, I can implement a special application for this purpose based on the information from the database, but could you tell in general terms how I can embed the start button of the application in the interface of the planning window?
p.s. Sorry for my English