Thanks all for an interesting discussion.
Launching extra tools from a menu is of course possible. I use mostly Linux (with a bit of macOS) so I confess Windows is probably the most "uncared for" of the platforms in terms of usability details.
Others have complained about the number of shortcut icons that are installed, so it's on the list to improve... it seems more logical to me to leave the launching of applications to the operating system (rather than having each application invent its own method). But perhaps having a menu in the main DoM to launch the combiner, player etc. would not be so bad.
I would say that a couple of the separate applications are only for convenience, and their functionality is integrated into other things (e.g. making KDMs, verifying). The playlist editor is pretty niche (and soon to be available via a web interface), and the combiner and editor are really hacks that allow things that I would rather were possible from the main application, but are not.
Generally I have tried to keep things separate where there's a use-case to use them alone (e.g. maybe somebody made a DCP in something else and just wants to write it to disk, so they start the Disk Writer). I understand that this approach is a bit more unusual on Windows/macOS than it is on Linux.
macOS also complicates things a bit with the way it packages applications. From what I can see it's not particularly straightforward to distribute a suite of applications like DoM where there are lots of shared libraries and resources and several applications on top. The current distribution method is very wasteful as all the libraries are included in each .dmg. I should look at how others deal with this.
DCP-o-matic will of course never be as capable as Resolve. I'm really only trying to add enough of a timeline so that those with existing assets can do basic composition and arrangement to avoid them needing another intermediate render. If Resolve's workflow is useful, of course it makes sense to use it. Maybe one day they will flesh out the DCP making parts and DCP-o-matic will be redundant.
Your misunderstanding with the need to change preferences to save in different folders is useful feedback, thanks - I'll see if I can improve that.
I always felt like a big "Make DCP" button was a waste of screen space for something you don't click very often, but maybe I'm wrong about that!
I know the full screen / not-full-screen behaviour is weird, I'll make a note to look at that, as well.