Magus Coeruleus
Explorer
Per RAW, no go because mounts have to be larger than riders AND at least size large. Any ideas why? I'd like to have Goblin Wolfriders riding Gray Wolves (as opposed to the much larger and tougher Dire Wolves). What would allowing that break, you think?
Also, since you only get one set of actions per rider-mount pair, if you have a mount that doesn't grant the rider special abilities or benefits, what's the point if the mount is both faster and has a better attack that its rider? Just the fact that it can be deployed more intelligently, perhaps? The occasional rider may have a minor action that's valuable, but probably not a major factor. I wouldn't want goblin riders to seem pointless.
Also, since you only get one set of actions per rider-mount pair, if you have a mount that doesn't grant the rider special abilities or benefits, what's the point if the mount is both faster and has a better attack that its rider? Just the fact that it can be deployed more intelligently, perhaps? The occasional rider may have a minor action that's valuable, but probably not a major factor. I wouldn't want goblin riders to seem pointless.