No choppers in A/C or flight plans

I noticing while using TTools, that there are no helo's in eather the A/C txt files or in the flightplans. Oops they wouldn't be any in flightplans if there are none in A/C txt files 
My question is why not and can they be added to the A/C list and then given flights to follow?
I think it would be neat to be flying in a cesnna or mooney and come upon a helo crusing along.
Can it be done?

My question is why not and can they be added to the A/C list and then given flights to follow?
I think it would be neat to be flying in a cesnna or mooney and come upon a helo crusing along.
Can it be done?