Is your feature request related to a problem? Please describe.
In the Load tab there is an option called "Instance Difficulty" with 3 different selections: None / Normal / Heroic. In the past the "Heroic" option applied to both Heroic 5 man dungeons and Normal 10/25 man raids, but I assume this was bugfixed at some point to not affect raids anymore since they're technically not heroic. Problem is I preferred how it was before, as I want some of my weakauras active in heroic dungeons & raids but not in normal dungeons.

Describe the solution you'd like
Add more options so you can multi-select between: None / Normal 5 man / Normal 10 man / Normal 25 man / Heroic 5 man / Heroic 10 man / Heroic 25 man. The last two (Heroic 10/25 mans) don't exist in TBC but I assume they exist in WotLK, so it would be worth it to get that out of the way.

Describe alternatives you've considered
The alternative is to duplicate the weakaura and have one active with "Instance Difficulty = Heroic" and another with "Instance Size Type = 10/25 Man Raid". Which works just fine, but it's messy when you have to fill your list with "dummy weakauras" solely because of a lack of this option.

Additional context
If you're wondering what kind of weakauras would need something like this, currently I'm using a Demoralizing Shout / Thunder Clap weakaura that could use these options. I like having debuff reminders for heroics dungeons & normal raids but there's no need for them in normal dungeons.

These options are there for retail version of the game, you are asking options for wotlk, they will be added if/when wotlk will be release.

I'm asking for options for TBC, which has Normal 5 man / Heroic 5 man / Normal 10 man / Normal 25 man.

If I want my weakaura to be active in Heroic 5 mans & Normal 10/25 Mans but not in Normal 5 mans, then that cannot be done with current settings (as far as I know) unless I create separate duplicate weakauras. I mentioned Heroic 10/25 man as an additional thing since I assumed it would be a good use of time to get that out of the way now that WotLK release is confirmed for late 2022.

Regardless this is a pretty minor issue so I don't mind waiting to WotLK for this to be added, I can live with duplicate weakauras until then.