If the list of ip-ranges is too long then there more solutions:
- it is possible now (actually since january) that you use an ip range like this:
63.1/16.*.*
That would include all ip ranges from 63.1.*.* to 63.16.*.*. The difference of the two numbers must be at maximum 16.
- with v4 it is possible to identify the computer a client is using (by an id generated based on your hard ware), it would be possible to add that thing to the new RemoteControl too and only allow access from your computer