All of @ZeLonewolf , @bradrh , @c0nsumer and @Hungerburg invited to join a poll in the Austrian community, which primary tag to use for shared use paths: Tagging für gemeinsamen Rad- und Fußweg (Zeichen § 52.17a)
PS: Anybody enlighten me on why a (mostly single use) purposely constructed MTB downhill race should be mapped as path instead of cycleway? C.F. Use of highway=cycleway for mtb trails – this concerns picture number three posted by @c0nsumer