I managed to do this with a recent install of version 7.4.2, so I know it is possible.
Here are my notes to self on how to do it:
Use the skins application to edit the default skin as indicated here:
http://extensions.xwiki.org/xwiki/bin/view/Extension/Skin+Application
Administer Wiki>Loook & Feel>Presentation
Select Customize.
Overrided Templates Add 'editactions.vm'.
Navigate to <hostname>/wiki/skins/flamingo/editactions.vm and copy the contents.
update the code as follows:
     #if($request.minorEdit)checked="checked"#end        TO
     checked="checked"
Sorry my directions aren't better, I am the on the bus to work.
Regards,
Jesse
  On Feb 29, 2016, at 3:39 AM, Bruno
<Bruno.Joffredo(a)ec-nantes.fr> wrote:
 Hello,
 Is it possible to make the default editions are minor and not major ?
 Regards,
 Signature mails
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 Bruno Joffredo
 Ecole Centrale de Nantes
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 Tél. 02.40.37.68.06
 Mail : bruno.joffredo(a)ec-nantes.fr <mailto:bruno.joffredo@ec-nantes.fr>
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