There is no /remove we just use a salvaged hammer as the remove tool. /p is for the jpipes so say you set up some large furnaces you can have smelted items be transported in a "pipe" to a selected box, /vip is to receive your daily airdrop, and /rec is used for a recycler that you can use wherever you are. There's also the /tp command where you can add specific people that are you in server friends and you can teleport to those players as long as they have you as their friend as well, there's also the /home for you to teleport to anywhere you have placed a sleeping bag(max of 10), I'm not sure if there is or isn't something for /t or /r I haven't even tried those but they may have been used in parts of the other mods that are added in.