Trap doors can now be placed on the top part of blocks, so you don't fall into a one block hole every time you pass over them. Would it be possible to do the same for rubber sheets?
I know this is a fairly unimportant suggestion, but I've been playing with them lately and it bugs me that you have to create a frame of blocks around trampolines in order for them to not phase out of existence(by the way, is it normal that they drop nothing and just disappear when they don't detect two blocks around them? Might have to submit a bug report after this). I imagine there might be issues with getting too much rebound and still ending up getting fall damage(minecraft seems to be wonky about caluclating fall damage in general right now), but having the option would be cool