@TMichael: I just updated the WaitForMissionTimerInit to the SVN. It may look a bit complicated but should be quite easy to handle. By default it now looks into 3 folders to locate the image. The image name may be just the name without the relative path and extension. Default folder still is "pictures\". (mi = 0)
Setting mi to 1 will lookup in each set folder to locate the image, If there is an image in more than one folder, it will be used.
There now is a global pset that can be set to a specific folder (currently pictures, Set-A, Set-B). Together with mi = 2 it will search the pset folder for imgname-a.png to imgname-c.png.
So if an a/b/c set of pcis for a mission is available, maybe best is to put it into Set-A, set pset to 1 and call timer sync with mi=2. Due to the global, this will only work for the mission where the pics are available, or the remaining space_ images have to be copied to Set-A then.
Hope the description helps, guess func has become a bit complicated in the end but I wanted to be able to globally switch to a specific pictureset if necessary.