The Sternbach blueprints have "ARBORETUM" for the exterior, but the corresponding interior is a vast empty area left unlabeled...
As for TOS shuttles, there was antimatter residue expected when one went missing in "Metamorphosis". From the sounds of it, though, this would only be expected if the shuttle were destroyed, or damaged and towed away leaking this stuff, as there was no such trail in evidence even though the shuttle indeed
had been at that very location!
Possibly ion power does involve antimatter. Or then it's related to the polaric ion power of VOY "Time and Again", and any non-Eymorg attempt at scaling up that tech results in extinction-level events but small-scale applications are fine. Or then those two are one and the same thing, and polaric ions (perhaps aka ion cascades, as in Dave Stern's novels) are a way to gently release the energies of antimatter without requiring expensive dilithium (and Starfleet does daily prayers for the tech working on shuttles, so that they don't have to beg Ben Childress for crystals to 23,500 small craft!).
In any case, there's little reason to think TOS shuttles would be devoid of warp capabilities - although it's pretty easy to explain away every instance of their use as sublight-only anyway (mothership dropped them off / picked them up, Kirk chased a starship while she was still doing sublight in the shallows, a long-lived thief didn't care whether his interstellar trip took millennia). Every instance, that is, except the inaugural "The Galileo Seven" where four star systems were within equal reach of the small craft
after it had been deployed...
Remarkably, there is equally little reason to think the TNG saucer would be devoid of warp capabilities. The only plots where the warp engine
should have been engaged are the two already discussed: "EaF" and "AoF". In the former, it quite possibly was; in the latter, it may or may not have been engaged, mainly depending on how long Lieutenant Logan decided to sulk in his cabin. In both, we were carefully denied the chance to see with our own eyes.
The idea that saucer warp is labor-intensive is a great way to deal with "EaF" and "Brothers" both. OTOH, clearly the thing wasn't designed for warp separation ("Inadvisable at any warp speed"), so the sustainer idea doesn't work well at all...
Timo Saloniemi