Requires a Dummy account
Open the command console: ESC > Gear Icon > Under the keyboard tab select Advanced > Check off Enable Developer Console
Press the ` button to open the console and type:
map ctf_2fort; hostname "boost"; sv_lan 0; sv_cheats 0; (I had to input this twice to be detected on my LAN for some reason)
That will create your match. Choose Heavy on the Red Team. Then type the following command:
mp_teams_unbalance_limit 0; mp_idledealmethod 0; mp_idlemaxtime 0;
Take the Heavy near the Blue spawn.
Use this command:
sv_cheats 1; sv_gravity 1; sv_cheats 0;
Now have your bot(s) jump in an area with a roof and they will fly but be stopped by the roof keeping them within shooting distance and slowly lower. This should make it easy to get the kills in mid air. Avoid using 0 for the gravity because if you accidentally jump yourself, you wont come down. Default Gravity is 800 for when you want to turn things back to normal.