Play against the computer in...
A possibility that wouldn't be bad for me: play in WormNET and LAN mode, not only with human players, with the computer as an additional team would be great.
That feature would be fantastic in normal- Intermediate games.
Sometimes, I play WA in a LAN connection with a family member. And we were talking about how we would like to have this feature in our games.
Sir Swerving commented
This is something me and my friends have wanted for a while with worms games, Players don't come around as often and they used to, Larger matches take a long time form, Additional bot teams in online matches would spice up the typical free for all matches between a couple of players.
Oh... I really would like that. ^ ^
I want to do some training and games with my little sister playing together against the machine. XD
It would be fun to 2v2 vs the computers with a friend :D. As far as I can tell, you can't cheat with this, because the computer screen symbol makes it obvious which teams are bots.
Once "custom missions" are finally implemented, I hope you will be able to do co-op over a network against the bots in a similar way.