Add the following lines to a file under your udev rules directory, preferrable is to create a new file for it (eg /etc/udev/rules.d/libmtp.rules) or just to copy libmtp.rules file (the one you get when you compile libmtp) under that directory....
# iRiver T30
SYSFS{idVendor}=="4102", SYSFS{idProduct}=="1119", SYMLINK+="libmtp-%k", MODE="666"
and I have no idea whatsoever what that means. On my iRiver the "Mount" is referred to in the "properties" but I'm unsure how to employ that too as even though I import that into the configure setting it isn't enough or is wrong. I also am confused over what is and isn't MTP(& MTP don';t require a "mount" reference?)