Hi,
this is available as of 1.6.0:
[gallery ids="1,2,3" size="large"]
You can also use a different size for thumbnails:
[gallery ids="1,2,3" size="large" thumb_size="small" ]
Vincent thats perfect thanks so much for the speedy response!
One thing, in a future release would it be possible to set the default sizes to use in the settings page? When using the plugin on a site clients will edit its often difficult for them to edit a shortcode, especially the gallery one. Would be great to just set and forget 🙂
Thanks again, awesome plugin
+1 for having a default setting for this, was just coming to post this same comment when I saw this thread. 🙂