Haven’t started using Glyphs yet, but planning to. Primarily for developing icon fonts.
Since font icons can look awful at odd sizes, I was wondering if there is a technique similar to interpolation for creating an icon font family with a version of each icon optimized for various target sizes.
Glyphs is quite well in managing interpolation.
depends on the design of your icons — if they are based on the same amount of paths, nodes and handles > http://www.glyphsapp.com/tutorials/tag/multiple+master
It is probably not possible. Because there is no linear relationship between the different optimized fonts. And how would you use that fonts? In websites it is very difficult to predict the rendering size and so ot is difficult to swap in the optimal font. So the best option is to draw it that it works good enought on several sizes.