Katana
As each constraint may behave quite differently depending on the length of the bone, presets may not even behave as you'd expect them.
You can however save a project with several bones having settings for their constraints that you like, then when you need them, import them into your project to copy and paste their settings (constraints settings can be copied now!) You can also edit multiple constraints as once if they are of the same kind, by selecting every cosntraint you want to edit at once, then editing the properties as usual.
