Sooo . . . I know the dev team does a lot of stuff, and I know that some of the stuff people have been asking about for a long, long time hasn't happened yet, but that it will happen.
So, I happened upon this idea, and it's of questionable cheese.
Let's say there's a feat that a character *knows* he/she would go for at a certain level, but that hasn't been implemented yet because the dev team has more aggressive maddened Kodiak bears to wallop. I know I'm traveling pretty far into the land of make-believe here, but let's say that the character manages to level up. Once in a blue moon and all that, I know, but it does happen. What if the character requested the feat slot at that level to be reserved, then leveled up? The feat list comes up, and the character picks any old feat he/she can find. After leveling up has been finalized, the DM removes the feat that was just added on, and leaves a DM comment saying, "X Feat Reserved at Level Y."
Then, the player is allowed to RP as having the feat, and when the time comes and the feat is implemented, the character says, "Oi! AH WANTS MAH FEEEEAAAAHHHTS!" in a polite fashion. The, either by script or by kindly DM who the player then thanks very much and kisses the feet of, the player gains that feat!
Example: You have a level 5 Druid with a wisdom of at least 13 that can wild shape into a wolf. In PnP, this would qualify the character for the Scent feat, which grants the scent ability. However, scenting has not yet been implemented onto the server! So, the character (probably by filling out a form on the forums) requests to have their level five feat slot held or "reserved" for the Scent feat, when it becomes available. Then, they RP as having the scent feat, track by scent, etc. When a DM sees the character is attempting to track someone by scent, the DM thinks, "Hey! He's cheesing!"
Then, the DM remembers the idea that sexy, sexy Draxiss proposed for reserving feats, and decides the check the character's description.
"Oh, wait! Looks like it was just a reserved feat, like the sexy, sexy Draxiss proposed! Good thinking, Draxiss. Now that he rule's the planet with an iron fist sexy mind, everything else is better, too! Hey, I might even decide to help this fellow here who's started sniffing around. Maybe I'll give him some IG clues for him to follow! Yeah, that's it! Then I'll have something horrible happen!"
Also, the reason why I have "'n Stuff" in the title is to entail the possibility of other things besides feats being reserved, with a bit of work.