MSFS has the ability to do time acceleration. I have bound a rocker switch on my CH Yoke for sim rate + or sim rate -
As for the iniBuilds A310-300, yes I have used up to 4x time compression in cruise with no problem. I'm not sure how it would handle 8x but just to be safe I've only done 4x.
I use an app called "SimRate Bandit" available at flightsim.to which has a verbal callout "sim rate 1", "sim rate 2", etc. when I switch.