On debian (ubuntu / linux mint should work too) this is quite simple. Grub2 takes menu entry names as default options. This can be done here:
# filename: /etc/default/grub # search for or add if it not exists: GRUB_DEFAULT='Windows 7 (loader) (on /dev/sda1)'
Your install might differ. GRUB_DEFAULT takes the menu entries from your grub.cfg usually placed in /boot/grub/
grep -o "menuentry '.*'" /boot/grub/grub.cfg
And here it is:
[...] menuentry 'Windows 7 (loader) (on /dev/sda1)' --class windows --class os $menuentry_id_option 'osprober-chain-XXXXXXXXXXXXXXXXX'
All what is left to do is update grub as super user: