God, i was desperately looking for this application. Thanks!

All settings can be found in a folder /usr/share/applications

I am in the /usr/share/applications folder and there are no settings at all besides some useless "bamf.index" and "mimeapps.*" files. Where are the settings?

Edited by th3blad3runn3r at 2016-10-12 08:22

Here you'll find a  generic how-to procedure, for those misplacement cases.

Open deepin-terminal, and run
You'll see all the shortcuts known by the deepin launcher. Locate a shortcut currently belonging to the category you want to place kdegames into (steam, for example)
Open it via nano (or vi)
Locate the line "categories" (at the very begining of the file), and copy it into the clipboard (ctrl+shit+c)
For example, my steam category is
now open kdegames.desktop (with sudo, because we're going to modify it)

Replace the line "categories" within the kdegames.desktop, with the one copied into your clipboard.
Feel free to replace Network and FileTransfer sub entries with someting more accurate.
Nota: Unlike the "steam.desktop" file,  categories line is usually located at the end  of the ".desktop" files..
Save the file and exit deepin-terminal.

You may have to logout (or at least invoke deepin-launcher twice), to see the kdegames now located into the right section.

Hth,
J.Ph.

Finally a sufficiently explained answer. Thank you very much!

Menulibre is also a good solution

sudo apt-get install menulibre