AI bots are, as Reckneya said, most likely not the problem, take a programmer and they'll do it.
Not to be a mean person but they are not jumping for that kind of work.
AI coding isn't easy at all it is one of the hardest things to create unless you want cannon fodder AI like in Blackdawn.
In UDK epic hasn't released their AI code as far as I'm aware so you are really at ground level.
(There are plans for that but don't get your hopes up)
Gamedevelopment is something you need to think through thoroughly.
1: Work out your idea/Theme make a development plan (What buildings, type of missions, weapons, characters etc)
2: What are your game constructs (Example: enterable vehicles, Max player number of 4, veteran system, crazy stuff like night vision)
3: Type of maps (Example: vast open fields or closed quarters)
Now some more question engine related
4: How many physical characters are in a battle scene each time (5? 20? 100?)
5: How many vehicles in each scene
6: Destructible terrain
7: Swimming option
8: API / control setup / Movement
This is just a quick list of questions I thought of while writing this post.
Game engines mostly are tweaked to serve a special role for the type of games that a developer wants to run on it.
Questions like -> "3: Type of maps" are very relevant due to the amount of polygons you can spend on terrain / How much engine load.
You really need a worked out idea before you select an engine.
Especially on the subject of AI.
Renegade X might not even be suited for your purposes.
First write out your idea, if you want I can review it and pose very annoying questions
Thinking out your idea is the most important step!!!
That will save you tons of time in making your idea.
Don’t be discouraged go and try to work on your idea!