Maxim introduced the ability to create duplicate UNO commands in bug 84258, but these newly created UNO commands arent available in the functions list in Tools > Customize. So the newly created 'New Slide' command (.uno:InsertSlide) isnt available in the Insert category, but the original 'New Page' command (.uno:InsertPage) is.
Confirmed (Add Command in customize) Arch Linux 64-bit, KDE Plasma 5 Version: 5.4.0.0.alpha0+ Build ID: f69424ff90f83136027df3063d4c8ddafdf79faa CPU threads: 8; OS: Linux 4.10; UI render: default; VCL: kde4; Locale: fi-FI (fi_FI.UTF-8); Calc: group Built on April 25th 2016
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This is by design, as commented in Bug 108458 comment 10 (see also the following discussion there).