I don't think that's something Apple supports on iOS. It *might* be possible on the Mac with a custom profile if you find the exact plist where that preference is stored. But definitely not on iOS.
List of all available Apple profiles and payloads:
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LITHIUM.InformationBox({"updateFeedbackEvent":"LITHIUM:updateAjaxFeedback","componentSelector":"#informationbox_1364a4dab6e82c","feedbackSelector":".InfoMessage"});
LITHIUM.InformationBox({"updateFeedbackEvent":"LITHIUM:updateAjaxFeedback","componentSelector":"#informationbox_1364a4dab6e82c_0","feedbackSelector":".InfoMessage"});
LITHIUM.InformationBox({"updateFeedbackEvent":"LITHIUM:updateAjaxFeedback","componentSelector":"#informationbox_1364a4dab6e82c_1","feedbackSelector":".InfoMessage"});
LITHIUM.InformationBox({"updateFeedbackEvent":"LITHIUM:updateAjaxFeedback","componentSelector":"#informationbox_1364a4dab6e82c_2","feedbackSelector":".InfoMessage"});
LITHIUM.AutoComplete({"options":{"autosuggestionAvailableInstructionText":"Auto-suggestions available. Use Up and Down arrow keys to navigate.","triggerTextLength":4,"autocompleteInstructionsSelector":"#autocompleteInstructionsText_1364a4d189da46","updateInputOnSelect":true,"loadingText":"Searching...","emptyText":"No Matches","successText":"Results:","defaultText":"Enter a search word","autosuggestionUnavailableInstructionText":"No suggestions available","disabled":false,"footerContent":[{"scripts":"\n\n;(function($){LITHIUM.Link=function(params){var $doc=$(document);function handler(event){var $link=$(this);var token=$link.data('lia-action-token');if($link.data('lia-ajax')!==true&&token!==undefined){if(event.isPropagationStopped()===false&&event.isImmediatePropagationStopped()===false&&event.isDefaultPrevented()===false){event.stop();var $form=$('