I've updated the Projectile Outlines Wiki Page (and some others!)
// Projectile outlines
ce_projectileoutlines_mode 1 // Only show when behind walls
ce_projectileoutlines_pills 1 // Enable projectile outlines for pills
ce_projectileoutlines_rockets 1 // Enable projectile outlines for rockets
ce_projectileoutlines_stickies 1 // Enable projectile outlines for stickies