I've got an idea and I think it can be used in some OXCE mods.
Currently, we have logic that if UFO gets out of radar range, you lose its tracking. But in some mods, like XCF, for example, we have radars with global range (that is balanced with very small detection chance), so basically, we can't lose tracking. In addition, not tracking chance is scriptable, so we can create interesting features around it.
I think losing tracking and searching for UFO with crafts is a fun mechanic, so I'd suggest some logic for UFO in `time30minutes`, that would give UFO chance to break tracking if chance for its detection is very low. OFC, we can define that "very low" as an integer value in mod, that would be also a feature toggle.