@bolshoi, I think there is. In gunboats you must communicatewith the other through builds, supports, etc. If you show your willingness for alliance, support, non-agression builds, that can help a lot. In a regular game you can agree on those, in gunboat metacommunication counts a lot more. The sooner you can form an alliance, the better you are.
Because of lack of communication, the answer is, yes, there is gunboat strategy.