Ive recently come of the opinion that a closed attitude to modding anything only hurts the community, while its nice to be asked for help, people will try their best to do it themselves. You might as well let them, if anyone steals your stuff its obvious and no self respecting mapper would do it.
Anyway, i'm pretty certain you could easily hex edit that prefab out, someone created an 'anti decompiler' for dungeon siege a while back. It took me 5 minutes to figure out you only needed to change 1 hex value to allow decompiling again.