Aerosplinter wrote:For Enjay, can you move up/down the files on 7zip or other zip editors, just like Slade 3?
I'm not really sure what you mean by that (I suspect axredneck has answered it though).
What I do know is that I have not encountered any file management techniques that are appropriate for use with a PK3 which Slade allowed but Windows explorer or 7zip etc did not.
I have seen some weird things that people have done in a PK3 which cannot be done using normal file handling techniques - e.g. putting WAD-style 0-length markers into the PK3 between entries - but I have no idea why anyone would want to do that; it is not necessary, makes for extra work and means that the file can no longer be opened and worked with reliably in anything other than Slade.
As axredneck said, PK3s support folders (and sub-folders, which are automatically read) and, if you use them properly, it is much easier to sort, manipulate, move and whatever else the lumps in your project because you are just using standard file management techniques. Nothing fancy needed.
Slade is still a valuable too. It is good for doing Doom-specific things: texture composition, sprite offsets (at least until the bug that made them difficult to save appeared - but I'm sure that will be addressed sooner or later), colour remapping, conversion of formats (including, of course, the Doom graphics format which most non-Doom tools won't read) and so on. It also has a map editor, of course. However, for simple operations like "I want to move 100 textures into the project and group them in sub folders according to [insert reason here]" using standard file management techniques (as used in Windows explorer or any decent zipping tool) is the way to go IMO.
If your project resources are contained in a WAD though, then a WAD manipulation tool such as Slade is essential and 7zip (etc) cannot help you there.