UX design problem: ignoring "@room" mentions globally seems like the wrong scope for how people would want to use it

### Steps to reproduce

1. Go to room settings
2. Go to "Notifications" to turn off `@room` mentions but not group mentions, which notably is possible on discord for example (where these are called `@here` and `@everyone` but that's besides the point)
3. You can't, you can only turn of `@room` mentions AND group mentions AND even personal mentions which seems honestly like the *least* useful way to do this setting that I could possibly imagine (although I acknowledge that might be just me)
4. Check global Settings > "Notifications" and find out that ignoring just `@room` mentions actually *does* exist as a setting, but for some really strange reason it's only available globally. Sadly, there it seems kind of useless from talking to other element users, since that's unlike discord's per server/per community and per channel granularity for this and almost nobody seems to want to use this on a global level.

In conclusion, maybe it's just me and the few people I talked to but it seems to me like this setting was wrongly scoped for how 99% of people are likely to want to use it and I suggest this to be fixed. I actually saw occasional fights break out with room owners using `@room` and then some users complaining more than once, and other users being like "ok but that was worth using", but then the argument "but you should never use `@room` because it's not possible to properly ignore it" thrown back: which honestly seems like it should just be entirely on this element issue and not on any of the room owners at all. This might therefore have more practical relevance than it might seem like.

### Outcome

#### What did you expect?
ignoring just `@room` mentions, as well as ignoring `@room` and all group mentions but not personal mentions, is needed in the room notification settings

#### What happened instead?
it's only available in global settings which seems to go against how most users would want to use it. i haven't so far met one person who thought that was the best place to put it

### Operating system

affects all operating systems running element web, I think

### Application version

Element version: 1.11.48 Crypto version: Olm 3.2.15

### How did you install the app?

https://app.element.io

### Homeserver

matrix.org

### Will you send logs?

No