I don't want to do that - customers may judge rigs out of shares and we all know that share stats can greatly depend on how good pool is
Exactly - this would be a good added value for customers - if accepted share percentage is low, they just might be mining at a bad pool and therefore they could switch to a better pool. And if customer is 100% sure that the pool is OK but there are still lots of rejects (for example > 10%) this would indicate a misconfigured/unhealthy rig. And yes, I agree that this information might bring some confusion ... it's all about weather to put providers or renters in a better position
And of course you would display this info only for the current rent period and would only be visible to the provider and current renter.
Besides, share stats are reset the same moment you turn off cgminer or you turn off proxy, so there is not much point in doing this.
True. Maybe you could only display efficiency graph ... rejected divided by accepted in percentage - this would "survive" cgminer/proxy restart.