I agree it would be fun and useful to have moving targets to chase. I am taking a note of your suggestions and will consider them for the future.
Yes I think it's best to let the user choose the screen recorder, OBS screen capture is a good free one for those who might be looking for one, there are probably a lot of other good alternatives as well. Those who have an Nvidia graphics card might prefer to use Nvidia Shadowplay for example.
As for the assignable buttons/switches suggestion mentioned it can be done by mapping the keyboard shortcuts to a button/switch on your transmitter with a program such as this (as mentioned in the earlier post):
Windows: http://joytokey.net/en/
Mac: http://alternativeto.net/software/joytokey/?platform=mac
Linux: https://github.com/AntiMicro/antimicro
(There are keyboard shortcuts for changing flight mode, starting a race etc., all shortcuts are listed in the user manual).
Thank you for the feedback, glad you like the simulator!