[OHM] How to tag historical milestones?

[Chris Helenius]

There are old milestones of stone pillars scattered around Finland, and
upon a trip I came upon a series of them and decided to map them for their
historical value.
I'm left wondering how their informational aspect should be turned into
parameters of OSM tags, since they only display the distance "left" and the
distance "right" (photo: http://i.imgur.com/OTgv5sF.jpg).
An old abandoned proposal 'Milestones'
http://wiki.openstreetmap.org/wiki/Proposed_features/Milestones suggests
'distance=00' or 'pk=00', but that covers only one direction.
The tags 'destination=' and 'origin=' also wouldn't work, since those
depend entirely on your direction of travel.
Are there any ideas or proposals? Should the tags just be 'left/right=00',
or a form of 'inscription=<- 00|00 ->'?

/Chris Helenius
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