Layered tiles

Hi,
while working on some animations on rather "high res" pixel art (128x128 character) I wanted to do some shading for my character and for that I used a second layer with 128 Opacity and Multiply mode. All good and well, until I noticed some weird stuff - the space which earlier was inhabited by a tile (the first tile in the walking animation of my character) was now tile -1 (which is no tile) after some experimenting I found out the problem: apparently PE can only handle tiles with one layer, and if something gets drawn in another layer over the tile weird stuff happens :O (the space isn't tile x anymore and the other layer interacts... weirdly with the not-a-tile-anymore). So here's my feature request: Can we please have tiles which can consist of multiple layers (layered tiles)? It would make some stuff like adding shadows/lights and some special effects onto an (animated) character (or shadows on background) much easier and modular.
Other than that and few other small inconveniences (rather unimportant stuff) I really love the tool and I can work really well with it, so keep going, I can't wait for the next update (let's hope it includes layered tiles :3 )