No build in Arduino, but a bidirectional serial interface to the RF explorer would be great. 115200,n,8,1
OPtional a signal strength indicator that delivers 0..5V so it can be connected to an analog in.
If I understand you correctly, do you mean you see value in an external connection, not bypassed by Arduino, which allows you to connect RS232 directly, together with a analog indicator?
That can be done and will be cheap, but won't allow users to customize the device except by using external circuitry which makes the whole solution more fragile.
Note external connectivity is available already, although through USB.