Allows the player to immediately cast from any stance by using the 'ready magic' key
From MCP readme:
"Allows the player to immediately cast from any stance by using the 'ready magic' key, instead of having to switch first. You can cast while holding a weapon; NPCs are also a little quicker to cast and can hold weapons while doing so. Using quickslots no longer changes stance when you select a spell or magic item.
You are still able to get to ready magic stance with the 'M' key. If any mods add scripted spells, you may still have to ready your hands first for the scripted spell to work, if the mod requires it."