This trick requires a Staff Of Mana. The sorcerer begins with one.
Set the Mana recharge ability to a quick key, such as [F5], and 
any other ability nearby (Firebolt, Healing, etc.). Set Mana charge
([F5]) and right click to replenish your Mana. Immediately after 
you right-click, change your ready ability to another ([F6], [F7],
or [F8]). If done correctly, the charge of your staff will not 
have been spent. This trick will make the game easier for the 
sorcerer, since you will not have to buy dozens of Full Mana 
Potions, saving money and space for healing potions on the belt
and found equipment in your inventory.