@Condor@Michal should improve
manual page with additional information, but till then:
- name image as for example "icon_s1.5.png". Text "sX.X" say scale of icon, so s1.0 = no change, s3.0 = 300% scale. Simple and super.useful I believe

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@lor74casfirst problem I see is that ETA values are not directly visible!
About speed modifications ... routers already compute time based on own internal system, so it definitely isn't good idea to completely throw this information away and just use up to three defined values. What about some setup how fast you are compare to routers times.
So by default, all people will have pre-set 100%. But when you notice you are usually in destination in half time, you just set somewhere that on bike, you are 200% faster. Should this settings be universal and useful? Of course, it will be necessary to have separate settings for routers and for every routing profile.
