interface hotplug q35 machine type

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I see that as part of libvirt's documentation [0] the q35 machine type will feature at most 1 hotplugged PCIe device - default - and users must prepare in advance according to their expectations of how many ifaces will be hotplugged: 

Slots on the pcie-root controller do not support hotplug, so the device will be hotplugged into the pcie-root-port controller. If you plan to hotplug more than a single PCI Express device, you should add a suitable number of pcie-root-port controllers when defining the guest: for example, add

<controller type='pci' model='pcie-root'/>
<controller type='pci' model='pcie-root-port'/>
<controller type='pci' model='pcie-root-port'/>
<controller type='pci' model='pcie-root-port'/>
if you expect to hotplug up to three PCI Express devices, either emulated or assigned from the host. 

Is there any alternative to this ? 

For our use case, I'm considering mimicking Openstack's implementation - [1] - and expose a knob that indicates what is the number of PCIe root ports to be used upon the domain definition. 

I wonder how open would the community be to having a machine type alias that would provide a "better" default - in the sense that it would have more root port controllers. 

[0] -
[1] -

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