I'm not aware of anything like this. The only problem I see with this is that many scripts will be custom and as you may know the TAC does not support custom scripts. In the scenario were a shared script fails to work, TAC will not be able to help.
Also, the 255 keepalives that you are referring is how many scripted keepalives you can run at any given moment. On version 4.0 you can run up to 16 scripted keepalives at any given moment. The limit on how many you can have installed is based on the disk space of your box.
I hope this helps,
Gonzalo