Yes it is indeed possible to mix remote and local help. The remote help
automaticly merges into the locally provided help. Regarding contextual
help you can in this case only reference the local help files.
Still this scenario misses my target of having all the helpfiles in one
place for easy maintenance.
As for supporting remote contextual help in future releases of eclipse I
couldn't find anything in the docs. If you find any information regarding
this I would be very interessted to get the links.