Hello
Ok guys in my opinion this should be a must-have feature let me explain.
I developed on WHMCS a solution to support an hourly-based billing system. It works with VPS, VoIP, web hosting and, of course, gameservers. Let me take as example a web hosting. Every hour i calculate the hourly cost of each hosting account based on CPU, memory, disk, network usage and email accounts, number of databases, ftp accounts and so on. The cool part of the story is that i can allow users to "hibernate" (suspend) services so that they will only pay for disk usage. For example in the summertime, people usually play less on gameservers so, instead of being forced to pay for a service that you can't use or cancelling all services and waste time to re-order and re-configure them few months later, they simply hibernate them. In this way, as i have already said, they will only pay for disk usage and not for CPU, memory and network usage.
Said that, on TCAdmin we are now able to retreive CPU, RAM and network usage of every gameserver but there's nothing about disk usage. Why don't you add this feature? You simply need to retreive the size of the main folder of every gameserver same as you retreive CPU, RAM or network usage.
Thank you!