Paul, Sorry for the slow reply. We've been discussing this issue internally:
For the project that I'm currently working on, I need to have a link to one particular workflow appear in the Tools left-hand side panel/frame for every user that logs in to Galaxy. They shouldn't have to import the specific workflow — it should automatically be listed. I know that I can create links in the Tools panel, but it seems that in order to access a workflow (via direct URL such as: '/workflow/run?id=12345') the logged in user has to either be the creator of the workflow or the creator has to have explicitly "shared" the workflow with the user.
Is there a way to grant "share" permission on a workflow to all logged-in users, so that I can list it as a Tool link and it shows up for all users, current and those who may register in the future?
Published workflows should meet your needs as they are accessible to all users. What we think should happen--but isn't yet implemented--is that published workflows should appear below shared workflows when a user clicks Workflows --> All Workflows. We plan to implement this in the future, but it's not a priority right now. If you do implements something of this sort, please consider share your code either by forking on bitbucket or sending a patch to this list; we welcome community contributions to the galaxy source code. Best, J.