I shoot my P-11 a lot and I could not do it without the trigger shoe. It should not be a standard "add-on", the Keltech trigger should be designed to be the thickness and width of the Shoe.
But since it is'nt yet, the shoe is a necessity for my old hands.
"D'yon't be reed-ICK-you-luss! Midi vas apparently feed-dink his pee-yet Minky! I beg your pardohn, ma'am, it is InSPECtor Cluzo... swine KTrangers. While I rrree main here I suppose I must ask for a rrreyume. What? Yes, a rrreYUME! YES! That is vaht I half been SAYING, you idiot!" 8)