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Hotkeys? There aren't any hotkeys.
You can only put a '1' somewhere in the .ini file, and as a result, when you press a certain button, it will activate the healing spell. Maybe it can also assign mana to a button, but I don't know. The bad thing is that it always uses the most powerful potion it has. And in general, I don't use it.
In general, the inventory with number keys 1-0 is sorely lacking in Heroes 1 and 2.
Staff? Two-handed. I wanted to develop a paladin with a two-handed weapon. Maybe I'm just bad, but it doesn't work out, so I ended up switching to a one-handed weapon, which is much faster. I just can't stand swinging so slowly -_- A two-handed weapon only makes sense when you've developed the character to 60%, then it's more or less usable. Otherwise, I can only use it in the first part, because there everything is done a little differently; a two-handed weapon is better than a one-handed weapon there, while in Heroes 2 they are equal.
And you won't take out six orcs with a fire arrow.