Quoting MuLaFlaga, reply 2Turn off the steam cloud sync and you should be able to del once again.
I've done that, and was able to delete my old custom sovereigns and units. But if I ever turn the steam cloud on again in the future, will they all come back?
Yes, unfortunately, though I haven't tested this again since .75. You can right click on the custom sovs, and remove them, and if you've made a custom faction with the same name as a previous, only the latest one is saved, IIRC.
I've got a buttload of factions I need to clear out; if this is WAD, the design is flawed. We need a permanent delete feature for all custom units, factions and sovs, if cloud syncing is going to be usable.