Keyless Entry and Door Locks

I have a 92 VR-4 which appears to have electric door locks, which lock both doors from a switch on the inside of the door.

Is one of the following possible:

1) When I lock the door with the key, have both doors lock automatically, and vice versa.

2) Install a keyless entry device to the electric door locks? Recommended brand and dealer.

Based upon my research, the VR-4s started to include Keyless Entry in 93.

Thanks