hmm...Maybe I should clear up the aura thing.
What I means was like say every 500,000pl, the aura increases in size. Once it reaches a certain level, that'd be the max and the aura would be very big. Stuff which you see later in DBZ and in DBGT.
And the screen would shake when you are charging up and have reached your max. While you are charging, the screen's of others shake at the same time indicating that you are nearing a helluva strong opponent.
Those two ideas just give the game that extra realism.