Recording Rounds in Single Player and Local Server Modes

You can use the Battlefield Demo Recorder in Single Player and Local Server modes in addition to downloading from multiplayer servers.
Start your round and open the console (~). Then type:

demo.recorddemo filename

Substitute filename with a name of your choosing.
When you want to stop recording type:

demo.stoprecording

To retrieve and playback your round, go to /Program Files/EA Games/Battlefield2/Mods/BF2/Demos and find your recording (remember the name you used in the console.
Copy the recording to My Documents/Battlefield 2/Profiles/Default/Demos. If the Demos folder does not exist then create one.