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Not all protocols need preferences. If the developer of the dissector for that protocol didn't find a need to allow/make the user choose to modify the dissector's behavior in some way then s/he wouldn't create a preference for that dissector.
Similarly, not all dissectors are registered appropriately for Decode-As functionality. If you have a protocol/dissector that you'd like to use with Decode-As but it's nor currently supported then please open an enhancement request.
Note that these two things are actually independent of each other: protocols can have preferences but not be registered for Decode-As or vice-versa.
