A quick scan through the listings suggests that there are more than those listed above.
There are also some slight variations in use too.
For “Solved”, you have also used “solved” and “SOLVED”.
For “Tip”, you have also used “Tipp”.
For “Active”, you have also used “ACTIVE”.
For “Reopened”, you also have “REOPENED:”.
For “Pending”, you also have “PENDING:”.
For all of the above, older entries also don’t always utilise the square brackets.
There’s maybe also “WAITING”, but I wasn’t sure if that was part of an original post title or not.
I think any solution needs to be very simple and consistent. But do note that forum members who get the regular status are not moderators, and thus that status can lapse. I think mine usually jumps in and out every few months, and I consider myself pretty active on this forum. As a result, there could conceivably be periods where no one other than Greg could actively maintain this approach, and I think Greg’s focus is probably more on support and development than it is on forum admin.
If this is a thing that people want, I would suggest creating a poll to get feedback and offering up options.
For example, tagging posts would be a less invasive way of doing this, but I personally don’t know if it would be easier for people to work from the titles.
On the principle using anything at all, I’m one of those people who doesn’t really pay much attention to it. I get ideas from reading posts where a solution is not found as much as where they are found. Sometimes ideas that didn’t work for someone else would work for me and vice versa. Similarly they can inform my understanding for how I might approach something. But I’m sure not everyone is like me in that regard, and I would not be at all against anything that is genuinely useful to people.
I agree with @sylumer that these status flags do not influence what I read. They may well be useful to others, but to me they are similar to political signs along the road. I’m aware that they are there, but I don’t read them and they don’t influence my decision-making.
What I think is useful is someone stepping in occasionally to clarify a topic — changing “I need help” to something more specific.
I recognize the best of intentions, but it seems to me that there’s a fair amount of push-back to this activity:
Let me cut to the chase here. I personally don’t think that someone should take it upon him/herself to change the forum for everybody simply because they think it would be a good idea. Any such change should be preceded by a discussion on that forum, resulting in a general approval of the change. Or at minimum, an announcement that “Here’s what I’m about to start doing”.
I’m sure that others may disagree with me; this is just one man’s opinion. But as the saying goes, “Just because you CAN do something, doesn’t necessarily mean that you SHOULD do it.”