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Ideas
UVs as Vec2/3/4
Unity 5.2 (or 5.1, not sure) adds the ability to set and get UVs as Vector2, Vector3, or Vector4 lists. It would be nice if ShaderForge could provide an option to read texcoord attributes as a fixed4 in particular.
Answer
In case anyone else absolutely needs vec4 attributes, here's a workaround I came up with. Just create a vec4 property node and name it "TEMP_UV3_CHANNEL", and treat it like a UV3 node. Also make sure to put a UV node in your canvas somewhere set to input 2 (don't connect it to anything).
Then once you've built your shader compile it and select the compiled asset in Unity and run "Tools/ShaderForge/Replace UV3 Channel". This will crap out a new shader next to the original with correct UV3 attributes.
Customer support service by UserEcho
This has now been added to 1.34!