no, what you have is fine.

As for the complete Code:

var video_mode= 8;
var video_screen= 1;
var video_depth= 32;

var count_of_ents;

ENTITY* _ball;

action ball
{
	_ball= me;
	ph_setgravity (nullvector);
	ph_fps_max_lock= 75;
	phent_settype (my,PH_RIGID,ph_sphere);
	phent_setmass (my,3,ph_sphere);
	phent_setfriction (my,30);
	phent_setelasticity (my,50,10);
	wait(-30);
	ent_remove(me);
	count_of_ents-= 1;
}

ENTITY* cam;

action dummy_cam
{
	cam= me;
	phent_settype (my,PH_RIGID,ph_box);
	phent_setmass (my,10,ph_box);
	phent_setfriction (my,10);
	phent_setelasticity (my,20,10);
	phent_setdamping(my,90,90);
	while(1)
	{
		phent_addtorquelocal (my,vector(0,20 * (mouse_force.y * time_step * -1),0));
		phent_addtorquelocal (my,vector(0,0,20 * (mouse_force.x * time_step * -1)));
		phent_addvellocal (my,vector(25 * (mouse_left - mouse_right) * time_step,0,0),nullvector);
		if(mouse_middle== on)
		{
			phent_addtorquelocal (my,vector(25 * (mouse_force.x * time_step),0,0));
		}
		camera.pan= my.pan;
		camera.tilt= my.tilt;
		camera.roll= my.roll;
		camera.x= my.x;
		camera.y= my.y;
		camera.z= my.z;
		wait(1);
	}
}

function spawn_ball()
{
	count_of_ents+= 1;
	ent_create ("earth.mdl",vector(random(200),random(-200),random(200)),ball);
	phent_addvellocal (_ball,vector(random(50),random(-50),random(-50)),vector(random(-20),random(15),random(-10)));
	while(1)
	{
		vec_set(temp,vector(_ball.x,_ball.y,_ball.z));
		vec_to_screen(temp,camera);
		draw_line(temp,vector(255,255,255),100);
		draw_line(vector(512,384,0),vector(255,255,255),100);
		wait(1);
	}
}

function main()
{
	level_load ("0g_experience.wmb");
	on_space= spawn_ball;
}

panel _diag
{
	digits(0,0,"Number of ents= %1.0f",_a4font,1,count_of_ents);
	flags= visible;
}


This is a script I wrote to test the A7 unlimited physics.

Code:
void main()
{
    cout << "I am MrCode,";
    cout << "hear me roar!";
    system("PAUSE");
}