How can I simply move in page with plenty editing fields ?

You can use Ctrl+arrows (Option+Arrows in Safari) for moving on most pages with many editing fields (table structure changes, row editing, etc.) (must be enabled in configuration - see $cfg['CtrlArrowsMoving']). You can also have a look at the directive $cfg['DefaultPropDisplay'] ('vertical') and see if this eases up editing for you.