JA+ Mod versions 1.4 and later
http://japlus.fragism.com/index2.php) can enable bots to accept duels
- Cvar bot_honorableduelacceptance (cheat protection removed): permits to duel with bot
If you want to duel against the machine, most people prefer to duel against NPCs (non-player characters). They are the same opponents in the single-player game. They are generally more capable than bots, and they don't just run the predetermined bot routes. Bots are better for (true) FFA, NPCs are better for dueling.
You must enable cheats, or again, JA+ Mod and other mods allow you to spawn NPCs without cheats. Just start your game, and when you get to the main menu, open the console (shift and ~) and enter /devmap <mapname> (for instance, /devmap mp/duel1).
To spawn a NPC, open the console and enter
/npc spawn <NPCname>, such as
/npc spawn alora
/npc spawn tavion_new
They will attack you immediately, so you might want to enter /notarget before spawning the NPC so they won't see you, then move some distance away and enter /notarget again so they will see you and start fighting.
Or, if there are a few favorite NPCs that you like to duel, bind some keys to spawn your favorite dueling partners:
/bind <key1> npc spawn <NPC1>
/bind <key2> npc spawn <NPC2>
If you enter
/bind KP_HOME npc spawn alora
everytime you press the keypad Home key you will spawn an Alora without having to open your console.