my Coby Kyros didn't have it either, so I just assumed it was a phone-specific feature. sometimes the ROM is edited by the maker of the tablet, so they may have opted not to include them for that reason?
Samsung Galaxy Precedent (rooted, AreaRom 3.4 , sd-ext w/ 3.65GB internal space)
Kindle Fire (1st Gen, rooted, AOKP JB 4.1, Nova Launcher)
Samsung Galaxy SIII 4G LTE (rooted, Carbon ROM)