@thestigma says differently in his post here: Google team drive server side copy which lead me to beleive that you can throttle the speed.
I want to throttle the speed because I am transfering TBs of data and trip the 750GB upload limit per day within an hour or two, at which point the script stops due to the --drive-stop-on-upload-limit flag. I want to just run the command and let it continue through at a pace which won't trip the limit until all the data is transfered, instead of having to rerun the command every day.
I could remove the --drive-stop-on-upload-limit flag but then the script would just continue on failing once the limit has been tripped and then stop, having failed for most of the time, still requiring it to be run again the next day.
Plus running the scrtip once each day give me no sense of how much data has actually been transfered in total, without having to keep a track manually of each transfer from each day and tallying it up.