I'm curious what happens if the floating licenses are booked. When all licenses are being used a new user will be informed that no licenses are available and then be given the option to wait for a free license. Since hydra will have an unlimited number of licenses, a user will always be able to obtain an IDL license on hydra. I have never encountered all licenses being utilized under the present scheme. There is no override.
Most users operate on hydra.
Since hydra has an unlimited license most users have never encountered the situation where all licenses are utilized. Nitron, with only a 6 user license, is an example of a machine where a user could have experienced the situation of no available licenses. IDL's license manager works only on instantaneous usage with no time averaging provision.