thx guys :)
some things are already in planning. i actually wanted to make a "custom object" section, where you can copy the behaviour of other elements, and that way create new sprites for existing objects. with that, you could create - more tiles, deco elements, or also lava, if you just copy the spike, but redraw it.
portal already exist @david dawn :P
and some general tool improvements like redo will also be done somewhere in the future :)