In order to quicken the workflow, it would be excellent to be able to assign a keyboard shortcut to switch into build mode, paint mode, and fill mode. If I press W to select a vertex and make a change to the mesh, I then have to click on the paint tool or build tool to continue working.
A single keypress could bring you from another tool to your last used sprytile tool. Then, if you press it again it could rotate through the sprytile tools. Or you could have a unique key press for each tool.