I'll be adding a bunch of runner prestige upgrades, such as making you start with extra runners, increasing their carry capacity, as well as speed increase. However it probably won't be just a flat bonus, but instead something along the lines of: "Runners get +70% speed, reduced by 5% for each runner you have, up to a minimum of 15%.". This way at very start when you only have half a dozen runners, they'll get a big speed boost, but then as you buy more it will slowly decrease to 15%, so that it's actually balanced.
As for reduced break time, I feel like it's already not that long, though some upgrades/artifacts do increase it. I'll add an artifact that also decreases it, but I've been actually thinking of a runner prestige called meditate: "Runners gain the ability to meditate. This increases their resting time by +50%, but gives them a chance to gain a random revelation after each rest, such as increased carry capacity, speed or luck, until they return to the stash." This can be toggled somewhere probably. This sounds like it could be a fun ability. :)
Actually I have plans for a couple of ore collecting rituals that will come with the new buildings in the full game. As a spoiler, one idea is the Shrine having The Great Tilt ritual that tilts the entire ground to the left for a few seconds, which causes all the ores to roll/fall into the stash haha.
Btw in case you haven't noticed since tutorial doesn't popup again after prestiging, though I think you have, but I've added the ability to click ore, which I think is a nice addition that feels good :)
Thank you for your feedback and encouraging words!