Thank you for your feedback!
1st inquiry: When you add multiple images, do you want the last one in the list to be visible or the first one?
2nd inquiry: Why don't you simply use a range of 0 to 100 Celsius for your CPU temperature gauge and only 4 states with the new "Custom (n states)" gauge type? That way you could use 3 blank images for 0 to 75 Celsius and a single blinking light image for 75-100 Celsius.
Maybe you've got slightly confused by me referring to the new feature as 101-state gauge. It supports up to 101 states, but it can even be just 2 states, or 10 states, whatever number between 2 and 101.
We've designed the new 101-state gauge configuration window to go by the filename, so you cannot assign an image with whatever filename to any of the 101 slots anymore. We figured because of the large number of states (and image files) it's best if you managed the state indexes straight in the filenames anyway, then you'd drop a bunch of image files in the list and AIDA64 will figure out how to assign them to each gauge state index automatically.