macdeployqt ignores custom plugins

If you have custom plugins, e.g. by using KF5 libraries that ship plugins or have a own plugin mechanism using qt plugins, macdeployqt will ignore them..

I hacked around that by letting it deploy all plugins in the qt plugin dir and install the plugins there.

Would it be acceptable if I provide a patch that allows to specify some additional plugin dir on the command line from which all .so/dynlib files are deployed to the PlugIns directory of the bundle?