Keymate - How to copy/move a block of keyframes to create a walk cycle

lancelmartin_cf51987037

I'm building a custom walk cycle and have about 20 keyframes (using keymate) that I want to just repeat for the next cycle.  I can't just copy keyframes .. move them down the timeline and then paste new keyframes because each keyframe has a z axis value as part of the setting.  If I want the model to walk forward, I'd need to adjust each and every keyframe to their new location on the z axis.  Is there a better way to do this? Come on ... there has to be a  better way to do this.