I've been using the mod target buttons forever, but the author doesn't seem to be working on it anymore and I was hoping for an ACE mod that does something similar. Here is the original mod http://www.curse-gaming.com/en/wow/addons-968-targetbuttons.html. Things that seem to be broken in the mod are related to the cross server BGs. Sometime my buttons will disapear when in a BG with a friendly target, and also things like the tell button don't work since it hasn't been updated to work with sending tells to cross server people.
Things I like about it are that it makes all the menu options for a target frame available through one button press. I'd say the ones I use most are inspect, trade, and whisper. Trade is really nice for instance in a raid where your trying to get a healthstone say. Target the lock you want, then run around in the crowd untill your little gold coin button (trade) turns gold from grey and you know your in range. Then of course the lock is busy trading already to instead of having to keep bring up the menu and clicking trade over and over you can request a trade with one button press.
Here is a small pic of me targetting some random guy in IF:
You can see the trade button on the far right is greyed out because he isn't in range for trade.
Another good thing is the ability to swtich the frame it's anchored too. I used discord unit frames so I was able to swtich my anchor frame from the default TargetFrame to DUF_TargetFrame for ease of set up. I hope someone will consider converting this mod to ACE or making one that functions the same way.