This really need to be done ASAP.

A quick work around to blacklisting peoples with weird and long names.

Click them in the chat and hit "Reply". /tell playername will appear in the chat box, delete /tell and replace it for /blacklist add playername.

/blacklist - Show blacklist.
/blacklist add “PC name” – Add a PC to your blacklist.
/blacklist remove “PC name” – Remove a PC from your blacklist.