So I have a Video and I also have a lot of GIFS to use in it, the last video that I made took me 2 days because I had to copy and Paste 12 GIFS about 500 times into the timeline to the end of the Video, isn ́t there any way to just stretch it to the end, like a regular picture?
An animated GIF is like a video in that you cannot simply stretch the end of it, you will need to copy/paste the content. If you were to stretch the end of the video/animated GIF, how would the editor (not just Camtasia) know that you want to loop the video, and not simply extend the last frame? Since videos and animated GIFs are not static content, determining what your intentions are would be rather difficult, hence it being the standard practice to offer a "loop" function (which we do, in the production phase), or to copy/paste the content on the timeline.
Your particular usage of that number of GIFs is rather unique, unless the community is finding that they use a great many animated GIFs repeatedly for the entire length of their projects? I'd like to hear more from the community and to see additional, regular examples (like yours, Adrian).