command history
My most common error by far, in using taskopen, is to run a command (without the -l flag) and then to hit the "up arrow" while at the Type number(s): prompt, in order to modify that command, and run it again. 

If taskopen could maintain a command-history, and users could scroll through it with the up/down arrows, while at the Type number(s): prompt, that might work. 

This is the "thin edge of the wedge" for some other non-numeric input I would like to use at the prompt. 
