Now it is possible to save/load properties to/from file. However in our latest project, we've found out that easier way to switch between different properties's set would be usefull. User would define some properties sets, for example different for every test environment, and he could switch between them with single click. Those properties sets could be also downloaded from some link.
It could be implemented as combobox and textfield next to load/save properties button on properties tab toolbar. After entering path or link to some directory, soapUI would load propertise files stored in that location, and would display them in combobox. After selecting item in such combobox, selected file would be loaded.