Hello francoteves, please read the forum rules before posting in the future.
The default go-to time when using G is already 20 seconds, which is a pretty long time IMO. But you can change the long and short go-to times in user.cfg. As for the acceleration curves, they cannot be adjusted.
LongGotoTime 15.0 // long travel time (seconds)
FastGotoTime 4.0 // fast travel time (seconds)
Defaults are 20 and 3, I use 15 and 4.