Cell borders

I've imported a sheet that uses some thick and thin borders. It imported keeping the formatting, but now that I've edited it some borders need repair. The border button doesn't allow me to do all the fixes- for example I can't put a think border on the only on a left or right side of a cell. In fact, Zoho only lets me add a thick border to the bottom. And looking more closely, this sheet uses thin, medium, and thick borders...

I see from older posts that a more advanced border edit feature was planned, has that been implemented?

thanks

(ps. This forum's spellchecker doesn't know "Zoho" is a valid word!)