The Protectors of Etheria is a stand-alone mod of the game Warlords Battlecry 3 (i.e. it can be run without having the original game installed - 100% free full game). It is an improved RTS/RPG game with new campaigns, quests, terrain, units, items, heroes, modding features and more. Beta versions available for download!
Hovering the mouse cursor over the hero spell section in the control panel tells the player how to set shortcuts for their spells. We get new players all the time and many don't know how to do this. So a handy popup in the context area should be helpful.