I am afraid tweaking of foot profiles will not help in tweaking hiking/running ETA. ETA calculation for foot profiles is AFAIK hardcoded to BRouter, perhaps some variant of Naismith or Tobler formula.
You could experiment to pretend during running you are a bike, with some experimental tweaking of the to-be-for-bike parameters.
Yes, I had already experienced that as a human bike

the ETA was much closer to my time. Unfortunately, the bike in the downhill and flat sections on easy terrain has too much advantage over one that runs on foot, so the ETA becomes similar on hard terrain, but if there are asphalted sections or fast descents the difference grows again.
In general, the ETA is very subjective and combining it with profiles that were created for navigation without being able to insert a personalization makes little sense, in particular when the ETA provides an absolute time and not a range between minimum and maximum. Specifically, the ETA calculated by Locus also provides an estimate of rest times, which is even more subjective thus providing an arbitrary total ETA. It would be enough to warn the user that the ETA is calculated without the rest times.
How difficult is it to calculate the ETA?
A lot to judge from this study:
Analyzing Tobler’s Hiking Function and Naismith’s Rule Using Crowd-Sourced GPS Data For both rules, 35% of tracks had predicted times within +/- 10% of the actual moving time. 70% were within +/- 25% of the actual time and 93% were within +/- 50%.
So I'm wondering if it makes sense to provide data that can be subject to such a high variation?
IMHO wrong information is worse than no data. The ETA at this point only makes sense for road routes by bike or car, it makes no sense on foot and on paths.
I would never want to know about a lost hiker in the woods (I saw
Jungle yesterday and was influenced) based on the ETA provided by Locus. It is better for everyone to evaluate their abilities in accordance with the type of track and weather conditions without blindly relying on a data that we know may not be correct. I know it would all be part of natural selection as Darwin teaches, but it would still be a marketing damage
