Edit .plist will hide both menubar and dock icon. Are there any way to hide the dock icon but keep the menubar icon?
You have to edit the Plist file for the app. Plist files use a key/value format, declaring the type of the key. The correct code is:
Stick these in before the
</dict> </plist> lines, and voilà. This works as late as High Sierra, and on the apps I have done this for it does eliminate the dock icon but not the menu bar one.
Yes, you can try this app http://foggynoggin.com/dockdodger
Works well for me