Yes, feed me, I live on the souls of the catfolk slain by these conversations about combinations of rule and physics.
If you were to try this a catgirl could work. The sprinter racial trait, Scaled Fist Monk 1 / Bloodrager 1 / Feyspeaker Druid 1 with the feats Dragon Style (b), Catfolk Exemplar, and Fleet, and the spell Cheetah's Sprint. A speed of 65 when running multiplied by 10 by the spell makes 650' and you can ignore difficult terrain. It costs her a spell each round though.
Just had a great (very rough) idea for a campaign seed -
Android Star Shaman arrives at X. He's carrying a RING OF SUSTENANCE and thus was sustained physically.
He's been born and reborn multiple times on a journey of indeterminate length. He no longer knows why he was sent or where he was going. He doesn't know if he was supposed to arrive at X or not.
He carries a message with him - a claw of some indeterminate, but perhaps... insectile? creature? (or something else).
According to wikipedia, 1 g (9.8m/s^2) acceleration can take you across the diameter of the galaxy in 113,000 years, but the traveler will only experience 12 years. The Star Shaman only accelerates at about 1/9 that rate, but I don't think it's a linear relation if you change the acceleration. In any case, I don't think any reasonable intragalaxy travel would require many android rebirths (maybe 0-1), so maybe make him an intergalactic traveler who is a nonstandard android.
hmm... he might just have a case of SPACE MADNESS?
Or maybe he (she/ze) got lost. If you're accelerating up to some noticeable fraction of c then you have to deal with blue shifting making your destination star possibly invisible, the apparent length changes distorting constellations and the fact that distant stars really do look a lot alike to the naked eye. Once they slow down and find themselves at the wrong star they'd likely have difficulty guessing where to go from there, and of course they'd have lost the speed they had spent so long packing on earlier.
OK, this wouldn't matter for SFS play or with a GM who prefers not to think about it.
Imagine that there's a hard limit of 20' per move, 80' per run action. You're in geostationary orbit. You take a 20' move relative to Earth and all is well, nothing much else happens. Then the next round you take a 20' move relative to the Moon overhead. The Moon of course is moving really fast relative to the Earth, about twenty thousand feet per round. This means you move 20' relative to the Moon and about 20000' relative to the Earth. Is this necessarily simpler than acceleration or some sort interplanetary flight speed?
If the ring gates or whatever were misaligned at all (and you can't really align them much better than human vision will allow, even with Goggles of Minute Seeing) then eventually the weight will hit the edge of the portal and either head off at an angle or break the portal. Probably well before you get fun effects.
Dunno AA, we're taking all the range increments here, not just 10. Early ICBMs had targeting errors of multiple kilometres. True strike might not be enough. Maybe give it some control surfaces and a suicidal AI?