I like to run Cloc (for Count Lines of Code) as an external tool.  Here's the command, for those interested.  Executable:

F:\Programming\CLOC (Count Lines Of Code)\cloc-1.70.exe

Arguments (the tricky part):

--not-match-f "\(.*\)" %{CurrentProject:Path}

When the report shows up in "General Messages", the columns are all askew.  I can copy and paste its output into Notepad++, and the columns line up nicely.

I'd like for them to line up nicely in QtCreator as well.  While there is theoretically a way to make it happen by passing QtCreator a style sheet argument or with styles, I have no idea where to begin; and it is not something readily available to the user.  While I can choose a font for the editor, I don't see a way to do it with these other output windows.  The results show up in the "General Messages" window, but I could see wanting to do this for others, like "Application Output", "Compile Output", "Version Control" and "Text Results".  E.g. the output of a bunch of compiles, a link and a few other things can be dense and hard to wade through - and setting the font might improve its readability.

None of this stops QtCreator from being a fine development environment for me, but it's a logical extension of what you already have, and would enhance its usability for me.