just as the title says when I have multiple objects selected in the geometry list and I change the probability value, only one object remains selected (the last picked one I guess).
This doesn't sound like a big issue, but imagine having a lot of objects selected and accidentally type in a wrong value or if you want to test multiple values. Then you have to re-select all of them.
The issue gets worse if you use the spinner instead of typing the desired value. Only one of all the objects updates to max, the rest get a value like if you clicked one of the spinner arrows.
Hope I did explain the issue well enough for you to understand. If not I'll try to make an animated gif.