To do that people need to go into the debug console in the Qt GUI. Are you saying that an option needs to be made available in the GUI as that is very doable?
Nope, I mean command line key. In NVC you are able to start client with the -nosynccheckpoints option, and this will disable checkpoints enforcement... User can add this option into shortcut or conf file and forget about checkpoints.
I'll make a patch soon, maybe.