Suggestion:
Add a way to check the status history of the machine by the owner (not necessarily the customers). If the machine had technical issues or downtime of a dead gpu or whatever, the rig's owner can't check how long the downtime was (unless he has some sort of monitoring software). Normally you can check your pool stats, but obviously you can't when rented.
A graph or something would be nice.
You can just enable settings->data log in cgwatcher and look there after lease, or in miner.log in cgwatcher folder, there's some info too.
+You can import that data log to excel to make graph from it, and you see immediatelly if there was downtime.
Not much convenient, but good enought for now.