So you know you actually save space and get better compression if you use speed beaconed productivity furnaces, you never need to switch, about 0.7-0.8 of a belt of input will lead to 1 full belt of output in furnaces, no need to swap speed for productivity. See the attached picture :) The power ...

It is a good point that my suggestion would replace intentional combinations of different modules.
However, for me personally, allowing full replacement of modules takes priority because it is something I'd like to do fairly regularly. For now I do it less often than I would like to because it is ...

What ?
Fast replace of existing modules with ANY new module type using CTRL+Click when the item is held in cursor.

Why ?
Right now it is possible to replace modules using CTRL+Click, but only if the modules are upgrades of the same type that already exists in the structure (e.g. speed 1 with ...