There has been a lot of recent confusion on this topic and the rules on this are constantly changing, so here is some clarification about what our current stance is on the use of client-side hotkeys for kits and other chat commands on KitPvP specifically:
Due to the fact that available kits can currently be claimed whilst in combat, players are allowed to have a hotkey (in Lunar, BLC, etc) set to claim a kit or perform another chat based command (/spawn) on KitPvP. Please note that any and all macros that do not fall under this category are still disallowed, and this rule only applies to KitPvP.
Another thing to keep in mind is that this rule has the potential to change again further down the road as new updates get implemented ingame by the development team, however management has confirmed that it is currently allowed. Hopefully that clears this matter up a bit.