@exus69 While George is pretty much right with what he said I might add that you could create individual image definitions for those partitions you want to deploy and push those out in three deploy tasks.
I know this doesn’t sound nice but I’d say it’s one route to go. Beside that we don’t have a plan to add this feature as of now. While I think we had one or the other request about this it doesn’t seem to be used by very many people and as the dev team is very short at the moment I can’t see us adding this any time soon. But that doesn’t mean if won’t happen. If you are keen and willing to join in we might consider pushing this forward.
FOG is open source and it needs people to work on it. We are more than happy to help and guide people. So it’s not, here is the code, do it all on your own.