Default Vignette (to Ext SD)

Using Vignette it gives the option to save to SD but not Ext SD. Sorry if it is obvious but this is my 1st device that has SD and Ext SD.

I have found this problem with some other apps as well (like cube or '3' for music) and I just want to even up the free space between SD and Ext SD. (16gb in both)

I don't really want to install apps2sd unless it works real well and considered a good option.