As most of the torrent websites uses infohash codes and most of the torrent downloading clients support infohash downloading it would be great to add infohash downloading feature.

Hello,
An example? Magnet links? FDM does support them.

Hi

Not magnet links. Infohash codes are shortcuts to the torrent files.
Its better to check the images so you could understand it better.
I have marked in boxes the infohash codes on torrent site and using those codes I am downloading files with qBittorrent.

Example Image:
https://drive.google.com/file/d/1VAxsp60jO96EPqooJedxuFMxn4j8d-3V/view?usp=sharing

Why don't you want to use magnet links? The site on your screenshot provides them.
Also, you can convert info hash to magnet link manually using this way:
magnet:?xt=urn:btih:INFO_HASH