Shadow Rules
A Shadow Jedi user focus solely on balance, they may be swayed by their passions for justice (a true justice) but they do see the process in getting it in shades of grey, thus they are sometimes referred to as Grey Jedi. They do not kill for revenge, but because it will keep the balance of the force and the universe.
A Shadow must control their emotions very carefully, they have emotions and they know when to use them and when to be in control of them so they do not 'slip' into what one would call a 'light' or 'dark' siders.
Shadows see the force in shades of grey, it is not the force which is good or evil, but the heart of the user defines how one uses the force. Thus, if one whom classes themselves as Shadow starts allowing their compassion for all lead them away from true justice (eg : failing to end the life of a major threat, and attempting to 'save them' as a jedi would) then they venture into the realm of Jedi.
If they believe in killing ALL darksiders (threat or not) or act out of pure, unadulterated vengeance they verge into the darkside.
Though, a shadow can have both compassion and vengeance within them, it is always weighed against a logic of 'will this bring balance, rightness and justice to the universe'.
Powers tailored specifically light or dark that take much concentration for one of that path, will be more draining upon a shadow despite their ability to access them, as they have to reach into themselves deeper to attain the same focus to use them.
There are Four Levels for Shadows.
LVL 1
Adept (normal)
LVL 2
Apprentice
Able to access all powers of this level (except those that require specific training). Use of non-universal powers (eg : light force healing or dark force rage) are extra draining and shift from light to dark specific powers takes 2 (two) rounds. Can still access universal powers in cool down.
LVL 3
Journey Man
As above but access to light/dark specific powers less draining. One round cool down to gather oneself between light and dark power use. Can always access neutral powers.
LVL 4
Shadow.
As above, access to light/dark powers with minimal drain. There is no cool down for shifting from light to dark moves as a Shadow has control over themselves and true balance.