That's not true, as you can see here:
The script does support auras. so 95% is 95% of your current max mana after auras.Code:currManaRatio:=PlayerStats.CurrMana/(PlayerStats.MaxMana-PlayerStats.ReservedManaFlat-PlayerStats.MaxMana*PlayerStats.ReservedManaPercent/100)
Just updated the script to support Steam, on the first page.