I absolutely love these ideas.
Especially the tiny mushroom prey. I mean, I am a huge fan of the tumbleweed. That thing is so original and awesome. We need more of this xD
The map portals were bothering me too, and I also could help if one requires it.
Some maps do need a revamp, especially those that are so... unnecessarily huge. One cannot find the prey at all, since they are so far and wide. Most of these huge maps are also mostly empty anyway. These maps need to be cut in size.
Forum contests are especially awesome ideas because this would increase activity. But these contests do need to be advertised ingame. Maybe through the start screen? This would need more frequent updating of the game, though.