Many updates to peeling bark from trees, and utilizing birch-bark as well, are on their way.
Most fundamental addition of all the bark related stuff is to allow harvesting birch-bark and feature it as raw material which can be used in many different crafts.
Takes a while before we get into adding crafts, but bark harvesting changes and additions have been made already, and they can be summarized roughly as follows:
Birch-bark is peeled in long strips, which are wound to a ball for storage. (These kind of balls of birch-bark are called Sommelo in finnish.)
Harvesting birch-bark in strips is slower compared to (already existing) ways of removing bark in sheets, but as a strip it's ready for weaving.
Moreover, time of the year now matters in harvesting any bark. It's best to be done in early summer, and gets more difficult (and eventually impossible) out of the proper period.
The bark yield (from a single tree) is also not constant but depends on the season and character's timbercraft skill.
And the biggest catch of this all that with adding birch-bark strips we'll be also adding unit of lenght to appropriate game items - that will eventually cover all the cords and ropes as well. So the requirements for birch-bark crafts are going to be eg. "16 feet of birch-bark strip" rather than some weight measure of bark. Many new possibilities open. But it's a hassle at first now to make conversions and routines understand the lenght. But that's my hassle, you just stay tuned...
These are future additions, not yet functional in current version 3.52.