Have you ever tried repeater regions with a Grid and Clique setup for healing. That way you just hover the mouse cursor over the character grid in need of healing and click the mouse buttons for all the healing spells. I have all 5 chars in a grid pattern and when the mouse cursor hovers over a character i left click to send one spell, right click another, mouse wheel foreward another, mouse backwards, and wheel click. This combined with repeater regions means it wont matter which slot i have in main window the clicks all go to healer slot and i get heals where needed.