This is a long post, I've added a tl;dr at the end to sum up my statements! Otherwise, feel free to read all of this lovely, lengthy essay.
To be fair, the Red Tracker function allows you to see for yourself what the Rioter has posted. Simply click on the big box containing the thread name, instead of clicking on the thread name, and you'll see what the Rioter has posted. This can help you decide whether the thread is relevant to what you are looking for or not.
I feel that differentiating the "good" Riot posts from the "troll" ones (troll, of course, being a very subjective word) simply is not as viable as you think. A filter for red posts that "actually matter"- what matters to one may not matter to another. What we have currently works well, I feel, and even gives you an opportunity to see what you are diving into before you click into the thread.
And about your champion rework bit: Riot has priorities already. There are things on the way, things that the community is not exposed to yet because Riot is simply not ready to show us. Surely, you would understand what the community reaction would be if Riot teased us something then didn't do it for another X days/months/years (cough cough East Coast servers/events cough cough). If we know it's coming, we'll become more and more irritated with the more time we have to wait for it. Riot has also changed their focus to quality over quantity (I discussed this in length with Griftrix) because of the overflow (again, a subjective viewpoint- I say overflow because there are 100+ choices to select now) of current champs we have. So it's not that Riot is neglecting the community or anything, they are trying to get the highest quality product out: and this, unfortunately, does not mean a short amount of time.
I wish I could promise you that changes are coming soon, but I can't. But what I can promise you is that Riot has worked hard, and is doing what is necessary to produce a high quality product that will hopefully please the community. Unfortunately, there are other current priorities like bug fixes, champion balances (this one is especially key because certain champions are definitely OP and require fixes as fast as possible), skin creation to balance out the number of skins per champion as well as fit in with upcoming events, forums (we're on Community Beta, beta being the key word here. Boards will be out sometime, and Riot wants to fine tune this as well so they can have a better way for a community to interact with itself and Riot as well), and several other things.
While your opinion is certainly important, your sole voice will not make it a priority for Riot. They make choices based on statistics and risk analysis (most of the time), which guarantees a better product (most of the time).
However, your opinion as part of the community is very important and should be treated as such. You certainly should not be afraid to voice your concerns, but as a company, Riot has a reputation to uphold, and this reputation is created by the quality of the product they release.
Thank you for taking the time to read this, and I hope it helps clear up some of the mindsets that Riot has (I don't officially speak for Riot, as I am not an employee, but I hope my post is mostly on point and clears up a few of the issues you mentioned.)
Cheers,
Otter.
Tl;dr Red filter within the red tracker= not so viable, Riot already has priorities and do what they need to to enforce quality over quantity.
-Last true buff besides the scaling MR last patch was V1.0.0.3
They took 20/15/10 seconds off of his ult more than two years ago, and that was it.