You can navigate within our table just like in Excel:

Action	Keyboard	Other	Comments
Navigate	Up-Down-Right-Left Tab, Shift-Tab PageUp, PageDown Home, End	Mouse movement
Edit any given cell	Enter key, just start typing	Double click
Insert new line - new issue (coming soon)	Insert	"+" icon at the beginning of the line, Context menu
Delete line	Delete	Context menu	Deletes the whole issue and its subtasks from that point
Copy-Paste	Ctrl+C, Ctrl+V	Context menu
Edit issue in JIRA dialog	Ctrl+E	Context menu	you can even edit Quick Sub-tasks with it

Browser not supported