How do I add a specific number of loop cuts? I know you can add a loop cut using Ctrl+R, but I want to know how to specify how many to add, i.e. add 15 loop cuts to a plane. I know you can manually use the scroll wheel to get this number, however this can be quite tedious.

Related: Increase number of Loop Cuts - Apple Magic Mouse
You can do this simply by typing the desired number (1 then 5) after pressing Ctrl+R and before left-clicking to complete the operation.