I'm going to take a little break from the WA Editor, so don't be alarm by my less frequent responses here.
Pawelec wrote:1. Will tentacle be able in Editor?
Some day. Don't know when.
Pawelec wrote:2. Can we make WOPs for all items (such as Outdoor, Buttons, Houses) with changeable ID and Active value (I need to make Watervine active after pushing a Button)?
Yes. However, many of them don't work as intended if you directly Activate/Deactivate them. For example, decorative objects still block the tile they're on even when they've been deactivated.
One way around it would be to use model substitution, or more precisely, change the object's Type to something like a gate that behaves properly when activated/deactivated. Maybe someday I'll make a WOP editor or something so you could more easily do this kind of stuff.
Can I use the Flip Glitch to place Bridge/Barrel and Button at the same tile?
Yes, but there might be some side effects from this. In particular, I know for example that buttons placed on water tile will make the tile always act like floor not water. So the tile with both bridge and button might or might not behave the way it normally does (eg. you might still be able to stand on it even when the bridge isn't active). Of course, I haven't tried out this setup which involves the flip glitch, so maybe it'll work differently. Just try it out and see.