The only "rules" that should be followed is the one that matched up. What is in the speedcam data files (.spc and .txt) should reflect the same in sys.txt
For .txt, it's simple, since you can read it. For .spc, it's another story. But if you don't change the "normal" set of speedcam alert types (about 10 of them), you should be ok.
As to crashing when you removed the .txt and speedcam.spdb, it shouldn't. Perhaps you should test without using any skin.
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