yes that does increase acceleration and top speed as you have more gears to work with
here’s an example: if you use a 6 gear transmission and u add another gear to the transmission, you get the same gear ratios for the 1st 6 gear ratios and you can modify the 7th so that you have an increased speed
Or you can copy the 1st gear’s ratio and put into the 2nd and put 2nd gear’s previous ratio onto 3rd and so on so forth and then you can increase the 1st gear ratio to increase acceleration