I actually once had a plugin patch for Ellye's ATB that did just that, I believe before Yanfly's existed (a version of this plugin has existed for a while), but I lost track of it a long time ago and I don't know if it would still work even if I found it. As for summoning actors, I'd need to see how it's being done. I have a lot on my plate, so I'm not prioritizing these, but I'll keep them in mind.
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No worries,
I've been trying to figure out some workarounds that seem to work fine so far, instead of being able to use the dual linked feature, I just have it add/remove "cannot move state" to the other member, which just resets their atb, while not as good, a decent enough work around.
As for the summon one, I've just used events rather then the plugin to summon, which so far seems to work and along with your plugin, but who knows if ill run into future troubles.
So take however long you need, I would probably only want dual link, with Ellye's ATB to work now anyway, if you ever got around to it or found what you use to have for it.