Runes:
I treated them as potency runes. They lasted until triggered, and number of runes on an item was the same as what was limited by the rules for potency runes.
This left me waiting until they were triggered or just replacing one rune with another.
I so wish it was a prepared list, with access to all the runesmith at the level they are granted. The known would change to the number prepared, making the class a little more versatile.
Old school rune I guess we get the listed free formulas, and assume we can just buy new formulas so we can craft others.
I loved the option to take a feat and whistle the runes at range for one action, instead of the two action ranged trace.