Instead of forcing the user to search, download and install the 'oc' library manually before being able to use port forwarding or log streaming, the platform-related binary could be installed automatically.
Possible implementation:

• define the oc binary URLs in stacks.yaml
• on openshift 3 plugin startup, check if oc binary is set in preferences
• if not set trigger background job to d/l oc binary matching current platform, and update preferences, else, do nothing.

manderse@redhat.com does it correspond to what you had in mind?