Pullback 1.5 is baking on the oven, it is compiled under the "new" branch of MinecraftForge and has been marked beta for that reason.
Note: This release is mainly a cleanup run new stuff is yet to be announced.
Redstone Jetpack Is Good For Construction But Could You Reduce The Redstone Fuel Requeriments? It's Ridiculous :1
I'll make the delay between each redstone consumption configurable, but remember, the jetpack is supposed to be a low-tier jetpack, so IC2 Jetpacks or SimplyJetpacks might fit more for your intended purpose.