When working on large definitions, sometimes you need to add space in the middle of a definition. But if the workspace is large already, it's a pain and potentially dangerous to select a lot of transformers and move them to make space (sometimes you can inadvertently mess up connections etc.). I have recently started using another visual scripting application called Grasshopper (by McNeel) which drives geometry in the very popular Rhinocerous, and came across a great feature that tackles this very issue very elegantly (see below). So I thought to post it here and suggest it for FME! You can click and drag as shown below to move the contents of the canvas and open up space without having to make any selection and move the actual components/transformers etc. Works both horizontally and vertically...really nice UI enhancement.
