Yeah if you could set it to "you" or "my" at that point in the script you'd have no idea what ent "you" or "my" refer to. Presumably they hold the pointer from their last use. Now not sure about this statement.
And you can #define skill1 - a bunch if different things
#define TREE skill[0]
#define BUSH skill[0]
#define FUR 333
#define PINE 666
void fun()
{
my.TREE=FUR // my.skill1 = 333
my.BUSH = FUR // my.skill1 = 333
