Can the Fabia vRS be programmed and/or modified for variable servicing?

No. The following advice from Skoda UK explains why not:

The appropriate service regime is indicated on the vehicle data sticker, which can be found on the front page of the service schedule. Data stickers containing the code QG0 can only be operated in line with traditional fixed service intervals. Vehicles identified with the code QG1 are manufactured to a different technical specification, which allows them to operate a variable-servicing regime. It is not feasible to upgrade vehicles designated QG0, as the Fabia vRS is, to conform to this specification.

In order to operate a vehicle on a variable regime the ECU ( Engine Control Unit) requires four variables: the distance driven, engine load, engine speed and oil temperature. In order to measure the fourth variable, vehicles equipped with variable servicing capabilities are supplied with an additional sensor within the vehicle's sump that measures oil temperature. However, simply fitting this sensor to a vehicle designated GQ0 will not allow the vehicle to operate on variable servicing as the ECU will not be able to interpret the information.

In a vehicle designated QG1, the four variables are compared against electronic maps within the engine ECU which calculates the "S Wear" (a comparison of the oil temperature and engine speed) and "S Soot" (a comparison of the engine speed and load). These maps are not found within ECUs fitted to vehicles designated QG0.

In addition to the above, in order to interpret and display variable servicing information, vehicles designated QG1 are fitted with a different dash insert.

Finally, in order to allow the vehicle to operate safely for up to 2 years without inspection, the vehicles are supplied with low maintenance lead-calcium batteries (with visual status) and brake pad wear indicators.