I usually add an extra midi track, assign it to my drum synth, and create a simple midi clip of usually pedal hi-hats on the beat, and if need sub-division of the beats, I will either mod it to 2 steps or 4 steps and add closed hi-hats for the eighth notes or 16th notes. I then just copy/paste and specify however many repetitions I need for the song.
I control its presence of absence through simple muting, and it can be transferred to somebody else as either a midi track or bounced to audio. I generally prefer sending it as a midi track, because then they can control tempo easily if need be, and they can always bounce to audio if they want.
Hope that helps,
Bob Bone