Tileset mode

Started playing with rx for the upcoming Rust game jam and so far I absolutely love it, in only a day my workflow is already far faster than it was in Krita. The only area I haven't been able to work out a decent workflow is tileset making. Currently I've been using individual animation frames for tiles, but then I have to reorganize them into a new png in my map editor. It also makes it hard work on vertical and corner tile transitions. A tileset mode where the frames are laid out in an n*m grid along with h,j,k,l navigation would make working this way much more seamless and I could go straight from rx exported image to my map editor.

Would this feature be desired for rx? I'd be interested in working on it, but from a quick browse through the relevant areas of the code it seems like a decent sized feature so I wouldn't be able to make any guesses on a timeline.