Ability to stack earning bonuses

It would be nice to be able to use earning bonuses on top of another earning bonus.
Currently, one bonus can be used at a time.
For example, if I have three 2x bonuses activated, the cumulative bonus would be 2x+2x+2x=6x. Each stacked bonus will expire(time/earning limit) at its own rate.
This could fix the issue that one must wait for either the current bonus to use its time/earning limit or replace the current with a new one that is about to expire.

just a note if you have 2x+2x+2x it would be 4x as they don’t add up like what you think

i agree with you as this would not waste our 2x