You have a very interesting point of view here. Please name at least 9 PC rpgs using a steampunk setting. Arcanum, Septerra Core... What else?
Hell, just try to name rpgs or games or anything period recently that's been steampunk based. Fable III, Resonance of Fate, Bioshock, Damnation, Rise of Nations: Rise of Legends, Steambot Chronicles, Rain-slick Precipice of Darkness, and that's about it from the last 5 years. Now the steampunk movement has been gaining....st..momentum, but steampunk as a paradigm for a setting hasn't been attempted very much recently. Dieselpunk, as a spin-off of steampunk has great potential, as demonstrated by the Leviathan series. giant walking tanks instead of tanks on treads, huge airships made out of whales that have been bred and evolved to breathe helium, etc.
The time travel one has a lot of potential as well. Do something Dr. Who ish like have the PC meet a major NPC in reverse(or random) order, give the player a bunch of different eras to explore, hell, you could just make it a Dr. Who RPG!