[Tagging] include smoothness=* in JOSM presets?

[Pieren]

First, most of the people using presets (JOSM or ID) don't read the
wiki. Tags have to be self-explanatory as much as possible.
And even if you explain that "smoothness=excellent" is for roller
blade, I know skaters that could use "smoothness=good" ways easily.
And I'm still waiting some clarifications between "very_bad" and
"horrible"... We also had long discussions about reducing/simplifying
the list of values...
I would also like to see at least one application using it, if any.

> I am not really happy about it, but I was unable to invent something better and it
> not as bad as say maxspeed:practical.
Do we have to choose between bad and worse ?
As already mentionned, the skater, biker or car driver will have a
totally different idea/view of what a "good" or "bad" smoothness is
for his means of transport.

Pieren