Thanks for your post.

Full support of sftp uri scheme as per ietf recommendation

This request is being tracked already:
https://winscp.net/tracker/93

uri support in command line

Supported already:
https://winscp.net/eng/docs/integration#url
https://winscp.net/eng/docs/commandline#session

... & .net api

Not sure what you mean. Please explain.

Full support of sftp uri scheme as per ietf recommendation + uri support in command line & .net api

exemple:

sftp://user;fingerprint=ssh-dss-c1-b1-30-29-d7-b8-de-6c-97-
77-10-d7-46-41-63-87:password@host.example.com:2222/;param=zzzz

thanks.