As with any application, you can't just expect to use a mouse to navigate through it, can you?
If you dig in through the Settings page, you will find a section for mappable keyboard shortcuts.
Wan to move through the charts with ease? Try out the arrow keys!
Arrow Up - Zoom In
Arrow Down - Zoom Out
Arrow Left - Move to the left of the chart
Arrow Right - Move to the right of the chart
Spacebar - Sets the chart to where the last candle is on the right