It's not really the actual transfer speed that interests me, but rather how the guest operating system sees the hardware.
That can be useful to test / emulate / simulate things under VirtualBox as it could 'emulate' to some extent the physical equivalent.
So 10mbit is just an example, also it could be interesting to have an option to have a Intel 10Gigabit driver option to simulate for instance the Intel 82597ex controllers with the ixgb driver, or to try the ixgbe driver for Intel 10Gb PCI Express NIC driver.
So 10Gig or 100mbit , perhaps an option to have the old ieef driver for the Intel PRO 100mbit NIC.
In virtualbox the e1000g driver seems to be used which is interesting, it does not use the 'xnf' driver like XEN based HVM machines, where you get:
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net0 Ethernet up 1000 full xnf0
The argument that it is 'virtual' could be used that it could use the 'xnf' device driver like in other virtualisation softwares, but VirtualBox makes the guest OS use e1000g (if you use the Intel Gigabit NIC) so I was (and I am) interested to what level the Intel NIC is simulated.
Unless I'm missing something , it seems you cannot change the autoneg and speed/duplex settings of the Intel NIC under VirtualBox.