Two cvars at the end of ConfigureMatchmaker(). mm_botsCount is the base bot count (0..31, overridable per queue via special.botsCount); mm_defaultGameplay is the fallback mode ID when a queue does not force one. The file lists every mode ID in the comment above the cvar. 

-- Number of bots. (type: integer; range: 0..31)
cvars.mm_botsCount = 6
-- Base game mode for a new game session; may be overridden in a specific queue.
-- Possible values (not all work):
-- 0 - none, 1 - space battle, 2 - capture the flag, 3 - capture the base,
-- 4 - control, 5 - practice, 6 - tutorial, 7 - PvE mission, 8 - free space,
-- 9 - sentinel, 10 - king of the hill, 11 - bomb the base, 12 - TDM,
-- 13 - GTDM, 14 - clanship, 15 - capture the frag, 16 - last man standing,
-- 17 - transport escort, 18 - open space, 19 - mission script, 20 - PvP mission,
-- 21 - football, 22 - battle royale, 23 - capture the base 2, 24 - hunger games,
-- 25 - one against all, 26 - ATDM, 27 - zombie, 28 - close distance,
-- 29 - autogen DM, 30 - three teams DM, 31 - april control
cvars.mm_defaultGameplay = 3
Stock default is 6 bots and mode 3 (capture the base). Crank bots to 20+ for chaotic localhost battles, or 0 for humans-only.
Additional Notes: 

Bots range 0..31. Comment warns not all mode IDs work.

Comments

16 + 1 =
Solve this simple math problem and enter the result. E.g. for 1+3, enter 4.