Slices have been incredibly useful for my current project which uses a sprite-sheet with over 850 individual textures.
However, using slices can sometimes feel a little clunky compared to other features, so here are a few things I think could be cool to add.
1- The ability to select slices, then hold shift to add another area of slices to that selection as you can with the regular selection tool.
2- The ability to use the arrow keys to move selected slices 1px a time, like you can with regular selections.
3- The ability to copy/paste selected slices, like you can with regular selections.
4- Showing the dimensions of a slice in the bottom info bar when resizing an existing slice. (Currently the dimensions are only shown when creating a new slice.)
5- The ability to hold shift when resizing an existing slice to constrain its shape to a square. (Currently this only works when creating a new slice.)
6- The ability to change the border color of multiple slices in a selection without merging all of their text user data into that of one item within your selection. (This is especially important for using this [ [Script] Export slices by groups as individual images ] plug-in, which uses individual slice text user data to define each slice’s saved file directories independent to their border color.)
Thanks for your consideration!