Because web browsers do not support OpenType layout features, we built a system that generates font files on the fly and can apply OpenType features directly to the file. This enables us to support true small caps as well as various styles of numerals. You can control these advanced OpenType features via your online account.
This means that selecting the checkbox Small Caps will replace the standard lower case letters with true small capitals. You can turn the small caps on and off at any time, while keeping the same CSS code.
If you would like to combine Small Caps and regular lower case, you will need to create two separate webfont projects.