Wireshark · Wireshark-dev: [Wireshark-dev] Decode As... Questions

[Peter Fuller <randomkodemonkey@xxxxxxxxxxxxxx>]

In the past, I have come across some data that was one transport  
layer carried in another (TCP carrying UDP).  My first inclination
was to use Wireshark's 'Decode As...' option to force the port in  
question to continue the dissection using the next transport layer
dissector.   Is there a reason that the transport layers are not  
included in the 'Decode As...'  list ?

Also, I notice that TPKT is listed twice in verison 1.0

rkm