align elements against one another, in the scene
When moving elements in a scene, there can be guidelines that indicate their alignment against the other elements.
For example, if I'm moving a certain element and drag it close to another one. When they are both aligned to the middle of one another, a faded guideline can appear, indicating this alignment. I hate to compare this to a feature in another software, but this feature exists for example in Microsoft Word, when moving "floating" graphic elements in a document, which is exactly what I mean here. I know there is an option to have a grid visible in the scene, which is great as itself, but for the purpose of alignment for elements, as described above, this is not accurate nor convinient.