The dome lights from a Passat W8 contain illuminated buttons, and red ambient lighting to slightly illuminate the center console at night.
The vents from a VW provide a more clean look for your interior, and contain illuminated icons. They fit into the dashboard of a Golf Mk4 without modification.
If your Golf Mk4 originally did not come with remote locking, it can still be added by changing the central locking module and doing some wiring.
Any Mk4 Comfort Module has the remote window functionality. However, the option is hidden through normal coding, but it can be enabled easily through EEPROM coding.
Normally locking and unlocking with the keyfob is not possible while the ignition is on. This option can however be easily enabled through EEPROM coding.