Hi!
Sometimes I start ManyCam and then afterwards I plug a USB camera in, turn an IP camera on, whatever. But in most cases these cameras are not detected by ManyCam - then I usually only have two options to get the affected videos back:
- stop and start ManyCam
- re-add the affected cameras to the corresponding layers
Both variants are a bit annoying.
So my suggestion - if it is not possible to handle these cases autumatically - is to add a function to refresh the current preset (initialize all cameras, connect to an app, …) and a second function to refresh all presets.
Of course this feature should also be accesible via Hotkey. 
Thanks for evaluating this idea in advance,
chipsy