After updating to either 10.0.1,2,3, my finder windows stick to all workspaces. Hope this helps. Keep up the good work!
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This was a necessary evil in adopting the Dockling interface. When you hide all applications, hiding the finder has the effect of causing another application -- chosen by the window server -- to automatically unhide. I believe this is a remnant of the "single window mode" experimented with in the pre-beta versions of OS X. In any case, now that Space.App is itself an application (once again), we can hide the finder without complications. The necessary changes have been made to the pending release.