I know this is uncreative, but it could be neat to change SMN to be similar to BLM, though it'd be a pretty big revamp to SMN... And you'd probably have to give them a new Swiftcast-like ability that only works on summoning Egis... but what if SMNs had to cycle through different Egis to get different effects, like one of them gives MP, one of them is for dots and the other is for nuking or something? Like I said it would be a big revamp that would require changes to MP cost and cast times of summoning, but I think having to use multiple Egis in a fight makes it feel more like a Summoner while addressing some of the issues SMNs are having. (The above ideas were off the top of my head and not thought out at all, I leave that part to you all :P )