I know some tuning companies wont touch the 118TSI engine due to how fragile they are and general reliability issues, but making them run richer is a good idea as they are tuned too lean from factory which contributes to running hot as well as detonation etc.
But like you said, even if they don't chase any extra power/performance and simply tune the vehicle to run more safely its a good idea.
Give Underground Performance in Cheltenham a call and see what they say. They do custom tuning for VW and other Euro brands. They will be able to dyno log air:fuel ratios on their dyno before and after tuning to make sure they are safe. Underground Performance
Otherwise some of the off the shelf tunes (eg APR, Racingline and Revo) still offer tunes for the 118TSI engine. Racingline OEM+ Performance ECU Software -1.4 Twincharger - Harding Performance
REVO Stage 1 Software for a VOLKSWAGEN Golf VI 1.4 TSI - Twincharger | Only REVO
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