1: they are thinking about either putting karambwans in the pk shop or replacing them with rocktails however this hasnt been confirmed
2: the eating system is fine i never get any delays or other issues while eating or brewin
3: there are alot of other ways of getting pkp just not directly but u can still do some pvmin like the roatz champ, donor zone monsters, or the chaos elemental you could either keep the items they drop or sell those to the pk shop or other players
4: they have also considered this if im not mistaking
good suggestions tho