We need a Toll to higher or lower the SimRate, easily in the toolbar, like in FSX. This is helpful for long hole flights. I don’t want to sit 10 hours in front of my pc, and this “skip tool” that we have right now, causes a lot of bugs.
So if we could add this tool, a 10 hour flight can be simulated in 2,5 hour, as an example.
You can assign keys to increase and decrease the sim rate.
I know, but I want it to be in the toolbar. And I want it to be displayed without any third party add ons.
Without an addon you’ll have to wait for an MSFS update, if it comes one day… 
While you’re waiting, you can use this one:
EDIT: My bad, Shift+Z Stats only displays the simrate but you can’t change it.
So you have to change your mind and bind keys or buttons on your yoke/stick, code a mod by yourself or waiting for the good will of developers…
I use this “simple” tool, which in “Start Travel” mode slows down before a waypoint and speeds up the simrate after the waypoint automatically
In my Steam version of the sim I can very easily control the sim rate with two key strokes!
Pressing R enables rate adjustment
Pressing CTRL+ speeds up the sim rate (2x / 4x / 8x) doubling the rate with each press of CTRL+
Pressing CTRL- slows it down by half with each CTRL-
CTRL+Z shows the sim rate
I did nothing to implement the above steps - they seem to be built into the sim
To change the sim rate you have to use ctrl+^ and then ctrl and + or - and you do not see the current sim rate. It should be fairly easy and straightforward to add a minimal UI to this. I think many simmers use the sim rate often on long flights.