As discussed in the following thread, the reseller implementation when overselling is enabled effectively enables unlimited resources.
When we implemented reseller services we believed if we set a limit of say 25GB of disk/250GB bandwidth and clicked overselling the following would happen;
The reseller could create accounts allocation out more than his allocated resources but once the defined values were hit(as a total for all his accounts combined) that some mechanism would suspend/stop/notify the reseller.
We would like to propose this as a feature.
We would suggest that something similar to the following is coded;
1) cPanel total's bandwidth/quota as per usual mechanisms;
2) cPanel has worker that runs every 12/24 hours(cpanellogd?) that totals the disk used for all accounts he owns, if used > reseller limit then do X, where X = suspend/email root.
I've managed to code most of it via the API's