I've seen a couple requests that ask TS to add a new feature to the "block" function.
The requests seem to come down to "if I've blocked them, I don't want to buy from them or sell to them".
Now, I think the idea is about as unfriendly and anti-Glitchian as it can be*, but in thinking it over, I don't see any real impact on the Auction itself. Assume (for this discussion) that the feature actually hides the relevant auctions (to remove the tears and drama of seeing something you can't buy or don't want to buy).
Would not seeing a tiny subset of the auction offerings actually change the overall function or results?
[*Frankly, the amount of coding and demands on the server that would be required to handle this request are so, so very out of proportion to the number of players who seem to want it, that I hope TS puts it at the very bottom of the 'requested features' list.]