2) Add a part to your assembly and then use a copy-geom feature to copy the points into the part. Then use a normal pipe feature (You'll have an external reference to the assembly). I see that your original points were created in a part, so this is probably not what you're looking for.
(I actually don't remember ever being able to add solid material in assy mode, but I've never used anything before rev14)
This is likely a separate part anyway - so create it as such.
Create an empty part, then add a couple of points to it, and the pipe feature if you need.
Then Assemble the Pipe Model, and then redefine the points that the pipe-feature is referencing to route through your Assembly.
Then you are basically done.
BTW - (and this is a Plug)
Check out the following turtorial on how to do this kind of stuff with the p-Shell API (Scriptable Pro/TOOLKIT). The tutorial has a nice tip on how to automate the reporting of Pipe Features on a Drawing Table also. -- Lots of Screen Shots - and the source code used to do it!