Application -> Hide (Command-H) is a standard shortcut in every mac app. Subform can be hidden but you have to right click the icon on the dock to access this. I rely on Command-H for my window management daily and Subform is the only app I have where this doesn't work. Please implement this (as well as "Hide Others" and "Show All")! Example:
Totally reasonable, I'll have "Hide", "Hide others", and "Show all" implemented in the next release.
Thanks for the request.