Make TBC great again - Arena123 macros
This is an appeal to the community to appeal to the Warmane staff to send information about enemies to players as soon as the gates open, so that arena addons won't bug out and keybinds and macros for target/focus/spells on arena123 will work.
Every day I get at least 3 different people asking me "to fix Gladdy greying out" and "how to /target arena123 in TBC".
It's possible, but due to limitations of the TBC API it won't work on enemies that Gladdy only finds, once you are already in combat.
Personally, the only reason it really bothers me, is because the classes that profit from this limitation of the TBC API are rogues and druids, which already dominate the arena scene completely.
The reason it happens is that addons create macros under the hood with /target name, as soon as it recognizes enemies. Now you can't change the macro state during combat, unfortunately, so for rogues and druids who stealth and thus are only caught by addons when they appear (and you're already in combat), targeting them with keybinds doesn't work.
Now I understand only supporting one addon seems weird. But most players wouldn't even notice, if you sent information about enemies, as soon as the gates open (as an addon message). If your worries are about supporting all kinds of addons, as opposed to just Gladdy, I would happily do the research for you to send the correct message to all addons like Proximo, Gladiator, Arenaframes, etc.
Or at the very least, I'd happily fix all those addons to read the message intended for Gladdy, or write a compatibility addon.
If you need proof, that this wasn't intended behavior by Blizzard, just look at them banning players for naming their pet like players to bug out addons and implementing arena units as soon as 3.0, modelled straight after such addons. I highly recommend not making the same mistake as them. It will just lead to continous player frustration.