This idea that your CD lens can get overworked is, as far as I can tell, bunk. The only thing that works "hard" in the PC Engine CD assembly are the motors that move the CD and move the lens. Those could get a little more wear and tear from constant speed adjustments and restarting, but the laser and lens don't get worn out. So yes, a poor CDR could put extra wear on your unit, but it would put wear on the motors and gears and moving parts, not on the electronics.
This post came off a little more grumpy than I intended. Sorry about the tone. I stand by the content, though.