I had the old 1.0TSI 110PS DSG
Ibiza Mk5 facelift for 2 years, and didn't have any issues with the 7 speed DSG, except for the distinct lack of power from 2nd gear when the DSG thought it was a good idea to select this gear for moving the car from almost a standstill. I did see somewhere that the 1.0TSI can be taken 'up to' 143PS with a remap and I'm sure these 1.0TSI are already outputting on if not over the 115-120 mark anyway. Dont forget, Ford Fiesta's Ecoboost there is the 1.0 in 100, 125 and 140PS tune stock, yet the
Ibiza is faster to 60mph, hmm...
Regarding mods (aesthetic) some would wrap/spray the chrome areas on the grill black, maybe wrap the roof black / carbon effect, some may put 'fly eye' effect on the headlights/tail-lights if legal in your country. If you are brave, you could try to pipe through the exhaust through the fake ones, or get an entirely new bumper and put a real exhaust there with a diffuser style.