How to make variable speed (some faster and slower) animations objects

I have been testing and trying to learn more about the awesome feature of animation in FF 11 Studio and have been learning how to use it by replacing the sliders with animation time or normalized time

I have seen that modifying the remapping of the normalized time you can increase the speed of the rotation, so if you put Minimum 0 and Maximum 2 it will be twice faster, or if you put 3 it will be 3 times faster and so on, AND it will keep the whole full cycle of the 360º rotation from start to end. You can also fractional values and put 1.5 or 2.2

1 - SLOWER THAN DEFAULT 1 - But what happens if what you want is to make it SLOWER than the default 1 value ?
Because you can not put 0.5 because then it will not complete the full cycle of 360º of rotation unless you have of course more frames, so I wonder if there is possible to have different Frames per second for individual objects?

2 - VARIABLE SPEED - And could it be possible to have some kind of acceleration in the animation?
for example start slow and make it faster? Could be added some curve ?
what I do not know is if there is some way to have different or variable speed with multiple animations of different shapes, images or objects.

So for example if I want to make one image rotate at the default speed and then another image that would rotate at half speed ? how would you do that KEEPING the whole values of the 360º rotation?

Here is a simple example of 2 images with animated rotation, one positive and second one negative. This filter is for FF 11 Studio

2 images rotated.ffxml

Thanks really very much for your help and expert wisdom that I admire much and love the unique and special things you are able to do

I knew that the only possible way could be using curves, but had no idea how to do it, and you have solved it very well, and at first testing it seems to work great, will test it more

Wish you all the best and that you stay safe and healthy