Hi,
Sorry, there's currently no way of doing this, but I'll make sure to add a way to disable it in the upcoming release of loadUI 2.0!
There is a (very hacky) workaround for now, but it's not optimal. You can create a groovy script, and run the file using the Script Runner, which will disable the discovery. This will have to be done each time loadUI is started though, and it will likely have enough time to send out one or two packets before you are able to open the project to run the script. Anyway, the script to run is here:
com.eviware.loadui.util.BeanInjector.getBean(com.eviware.loadui.api.discovery.AgentDiscovery).release()
Regards,
Dain
SmartBear Software