I like the ideas!
1) I would KILL for a real-time heightmap builder. I am assuming that you are talking about having different "terrain brushes" that will increase/decrease the land as you see fit? If so, that would be an honest time-saver; however, if they do that, I believe that they should add brushes to "paint" on different textures to different parts of the map!
2) Again: awesome! This would make life SO MUCH EASIER with specific markings that are tough to nail. Chest/neck markings along with cheek markings would be so much easier to do if you could see real-time on the character. Sometimes it will take multiple attempts and can be a lengthy process, but this would cut that time in half or even more!
3) This idea is cool but might be a bit tough to pull off. I could see something like this happening if it were an easier thing to manage. You said that you'd like to see it with an age-restriction on the chat? I think it might be easier if they did something that was not really on an age restriction, but more like how Discord has the NSFW chats. The overall issue with this though is that it is against the community guidelines to swear/use profanity, so I feel that something like this would be promoting the use of swearing.
I love these ideas and the creativity behind them! It is so interesting to see everyone's suggestions for the games, especially when they have a high probability like these!
I'm all for having a real-time creations..
Having the motivation to actually start making presets let alone maps is hard to come by sometimes...
And then having to do a continuous / tedious process of close and open time and time again can get a little tiresome.
Nice ideas c: