If I understood right, you said/asked that there was already a pugin for TC?
Yes, there is already a plugin, but it is not as handy as winscp.
I do not know, what winscp-plugin for FAR or ServantSalamander looks like and what its abilities are, but I know the TC plugin you mentioned. It is quite simple.
I would like to see a winscp-plugin for TC too, hoping for easier use and more feature then the existing plugin.