(Petalshop) List owned ranks/perks as "already purchased" or similar

I have no idea if this is a feature on SMP/RPG already. If not, this could maybe also apply to the other gamemodes? I also have no idea how much trouble this is to add (or if this would be more trouble than it's worth) but want to bring up the idea. I think it would be nice if it showed ranks/perks that you own as "already purchased", "you already have this", etc. Some examples. If you have Warlord rank, it shows not only Warlord rank, but ALL of the lower ranks as "already purchased" If you have Warlord, it shows the name colors, chat colors, and glow colors as "already purchased". Possibly also vaults assuming these don't stack with the ones from the rank. I bring this up partly because I noticed that there are certain perks in the petalshop that also come with ranks, notably the perks under "colors", and likely the vaults. It's possible someone could buy a rank, then buy one of these perks not knowing they already have it from the rank (hopefully there is a check in place to prevent this purchase, if not, such a check should be added at least)