This code snippet will automatically open the Gravity Forms field settings pane and navigate to the desired tab on page load.

Auto Open Field Settings.js

/***
 * This code snippet will automatically open the field settings
 * pane and navigate to the desired tab on page load.
 *
 * To use, just add the tab to the hash of the page URL:
 * 		http://example.com/wp-admin/admin.php?page=gf_edit_forms&id=1#tab=gform_tab_1
 *
 * By default, the first field in the form will be opened.
 * To open a different field, add a field ID parameter:
 *		http://example.com/wp-admin/admin.php?page=gf_edit_forms&id=1#tab=gform_tab_1&field=4
 */

( function( $ ) {

	$( document ).on( 'ready', function() {
		setTimeout( openFieldSettings, 100 );
	} );

	$( window ).on( 'hashchange', openFieldSettings );

	function openFieldSettings() {

		// If this is not the form editor page, exit.
		if ( $( '.gforms_edit_form' ).length == 0 ) {
			return;
		}

		// Get hash.
		var hash = window.location.hash.slice( 1 );
		    hash = hash.split( '&' );

		// Initialize paramters object.
		var params = {};

		// Loop through hash array.
		for ( var i = 0; i < hash.length; i++ ) {

			// Get key and value.
			var values = hash[ i ].split( '=' );

			// If key or value is empty, skip.
			if ( values[0].length === 0 || values[1].length === 0 ) {
				continue;
			}

			$.map( values, function( val, i ) {
				val = val.replace( /[^a-z0-9áéíóúñü \.,_-]/gim, '' );
				return val.trim();
			} );

			// Add to parameters object.
			params[ values[0] ] = values[1];

		}

		// Set default tab.
		if ( ! params.tab ) {
			return;
		}

		// Sanitize field ID.
		if ( params.field ) {
			params.field = parseInt( params.field );
			params.field = isNaN( params.field ) ? null : params.field;
		}

		// Prepare field selector.
		var fieldSelector = params.field ? '#field_' + params.field : '.gfield:first-of-type';

		// Open field.
		if ( ! $( '#gform_fields ' + fieldSelector ).hasClass( 'field_selected' ) ) {
			$( '#gform_fields ' + fieldSelector ).trigger( 'click' );
		}

		// Switch to tab.
		$( '#field_settings .ui-tabs-nav li[aria-controls="' + params.tab + '"] a' ).trigger( 'click' );

	}

} )( jQuery );