Boost is the same every race, always used at the last few laps of a race by the top teams and isn't really close to real life racing. So my suggestion is to bring in ERS. ERS will charge up by around 40% a lap, and when the player uses ERS he will get a small speed boost for an amount of time, before running out or player stops tapping/clicking on the button. If the technology level is higher the longer you can use it and the more powerful. Not as dramatic of a speed boost as what boost is, but enough to allow overtaking. ERS will start at 100% at the start of a race.
If this does get added to the game, as it's a replacement for boost if your boost is maxed out in the technology facility, you don't need to upgrade ERS all the way up
Sorry if this doesn't make sense, often repeat myself a lot:)