I saw quite a few people asking for this in game on release

Mod Ana: This is on our list of FIFA 15 Coins feedback changes to make.Could it be possible to change "buy" into purchased" for permanent rewards in the rewards interface?Mod Ana: This is on our list of feedback changes to make.How about adding Muncher (or a Muncher puppy) pet to the list of possible rewards?

Mod Ana: I saw quite a few people asking for this in game on release :)! Perhaps we could look into it in the future!Are there currently any plans to allow remote access to the Reaper and Slayer reward stores?Mod Ana: This is not currently in our plans.

It is much easier and safer to restrict the reward stores to Death/Slayer masters as then we know what the player buying the reward is doing and where they are. If you could access it remotely, you could be anywhere, doing anything, and that could lead to bugs.