1, For simplicity sake the answer is yes, realistically it can be done, but the simpler way is to put it at the root and use a shortcut on the desktop.
2. You can create another windows user on the PC (preferred since you know tthe user will never change their password and break everythig) or use the regular users account assuming they have a password (password is required for the printer), to add the user click Add where I highlighted how the username will format.
3. Use the IP address, not the name