A comment on your rendering proposals: In your proposal you write:
Rendered as: a dashed line in blue off to one or both sides of a road (for example) : and cycleway <https://wiki.openstreetmap.org/wiki/Key:cycleway>=soft_lane <https://wiki.openstreetmap.org/w/index.php?title=Tag:cycleway%3Dsoft_lane&action=edit&redlink=1> could be rendered as a solid, dashed, or dotted line in (for example) blue off to one or both sides to the road, similar to the way it is done by opencyclemap <http://www.opencyclemap.org>. The dashed blue line / solid blue line are used by OCM to render a parallel cycleway / an on-road cycle lane. So these two renderings are already taken in OCM and should be recommended for the new soft-lane tag.
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