TomatoUSB

Can add user account "Write Only" Access?
If not, How can I do? Use Custom Configuration ?
Thank you…

no

On FTP you can set to every user: ReadOnly / ReadWrite / ViewOnly / Private

Nevermind the (guest) trolls. They're always out to mess with the new users on here for some reason.

Yes, you can set users to read only. In the Tomato GUI go to USB and NAS>FTP Server> and at the bottom of the page, under the heading, "User Accounts" pull down the menu item for "Access" and change it to read only for your users. If you want to give your users a folder that they can upload to, have them log in with a different account and give them a separate upload folder as their Root Directory.

In other words, JamesDown can log in and is put into the folder, "Downloads," that you have specified as his root folder. Since he only has 'read only' access to any files and folders that are in this folder, he can't write (upload) to it or delete anything. JamesDown then logs out and back into his upload account called JamesUp. This account's root folder is, "Uploads." This is a separate folder that has nothing in it that you're worried about losing, which he can read and write to. He will be able to upload to this folder, download from this folder, rename files and folders, delete files and folders, etc. - but only in that Uploads directory. Read/Write access is recursive, however, so you don't want the one folder under the other's directory structure. Keep them separate.

Unfortunately, this is the only way to give the same person read only access to one folder and read/write access to another folder. It's why I stopped using Tomato's FTP server and am currently using something else.

thanks for the thorough answer, this is how i've been using read/write access as well on shibby. what did you ditch tomato for instead?

OP asked "Can add user account "Write Only" Access?"

Not "Read Only".