While Tools already supports editing 2D and 3D images via the Adobe Image Editor, the next beta will include support for editing 360° x 180° equirectangular images. I still need to implement the "high-resolution save" option for scene images - as most equirectangular images are at least 2000 x 1000 in size. This features will probably roll out with the next beta sometime down the road. Until then, you can see a video showing the editor working with equirectangular images here: https://www.youtube.com/watch?v=ted3MeiJJFo&feature=youtu.be
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