One suggestion would be to tone down or remove the glow effect when you hit a new 100th speed. Once you get to the high speeds ( 1000+ ) It can be very distracting, and has made me die a few times.
just a tip till this one gets updated, if you press the fast forward button then, right click it will stay fast forwarded just dont click anywhere else
 "Accelerator"){kind=icon}
 "Bloons Tower Defense 4"){kind=icon}
You can turn off the effect in the options :)