I think you can change the foldernames and remove the ! or whatever. I suppose they do that to put their folders on top of each library, but not to annoy the customers but make it easy to find the new items. When you have a lot of stuff in your librarie and use the automatic install for your files you sometimes end up searching for your new items. This way you find them at once and then you can change the foldername and put it elsewhere. If you do not use the automatic install (I never use it - even the DAZ exe files go to a temp folder first) you can rename the folders before you move them to the libraries.

Every organisation rests upon a mountain of secrets ~ Julian Assange