Couple of things, not sure if the save and load of presets work correctly. Saved two blocks last night, went to use them this morning and they have minus sizes?
One other thing, the Context Menu via c, you have to hold the c key to get it to display, so when you go to save a block and give it a name the dialouge for `Enter a preset name` fills up with "c characters". Maybe have context menu as a toggle rather than a hold down?