By default, QGIS provides transparency widget but this can be extended by plugins registering their own widgets and assign custom actions to layers they manage. from QGIS 2.18 Manual
How can I create such a widget?
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gotjosh
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I am not completely sure, but does this post answer your question? https://gis.stackexchange.com/questions/232367/showing-transparency-slider-by-default-in-layers-panel-of-qgis – Martin Hügi Aug 16 '17 at 20:01