I could leave the RD and use the shifter plus RD barrel adjuster to set it (then zip tie the shifter) but I'm not sure if that puts me at increased risk of dropping the chain (since only spring tension keeps the RD from moving left). In any case, I think fiddling around with RD adjustments is probably more time consuming than just swapping in a chain tensioner. Yes, I'll have some RD adjustment going back to geared, but SS is the last wave of the day, so the transition back to geared has the luxury of time (and cleanup, and thawed out fingers ).