My Courier would start controlling Vegas and expanding its territories, attacking NCR and Caesar alike with my Securitron army. On weekends, I'll stop by Goodsprings and chat it up with my buddies.
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My Legion Courier would do the following:
1. Ask to be the governor of New Vegas and to be the rank of Centurion
2. Shift the Legion raiding parties from slavers to a peacetime police force for the Mojave
3. Convince Caesar that I can be the Mojave Legate and divide the Legion into two parts
4. Put a more friendly face on the Mojave Legion
5. Broker a cease fire with NCR and ready the missiles of the Divide in case they get any ideas