You can't just do a friends race and invite teammates. Your teammates are people who have the team tag that you have EX: (ASMSHRK) and then their name.
There are machines you can buy that will pump the mole's tunnel with carbon dioxide to put it down. Those are fairly effective. The mole won't experience any pain either,...
Coloring them with a Sharpie pen won't hurt their functionality on the game portal, so they should still work with the games just fine. As for cleaning off Sharpie, try...