As with Photoshop, Manga Studio has a full set of quick keys that can be used. They will also enable you to press and hold a key to use a command function temporarily, before returning you to the tool you were already using. The tool will default to the sub-tool most recently used, so, for example, pressing W for Magic Wand will select the Select from Reference Layer sub-tool, assuming that it was the last Magic Wand sub-tool you used.
W – Magic Wand G – Gradient F – Fill P – Pen/Pencil
(This will cycle through either tool if used repeatedly)
H – Hand
Pressing this enables you to use the mouse cursor to move the canvas area around. You can also add your own preferred shortcut keys to Tools, Tool Options, Menu items and Actions using Manga Studio’s Shortcut Settings option.