Quoting from the Modding guide post:
THE MOST IMPORTANT KEYS IN THE EDITOR:
+ and – on the 10-key will increase and decrease the size of the cursor.
problem is i don't have a 10-key on my key board 
. It might be nice to put a +/- somewhere in the interface for those who don't have a 10-key (for example notebooks) or else an option to change key bindings could be a nice addition as well.
