Yes – discussed above.
There are detailed images on our website and you can see close ups of the remote too.
Haven’t tested – but it will be the same as other OSMC platforms. So if it works on Pi it will work on Vero 4K.
In theory: yes, but you’d be on your own here. Retrogaming is already possible however with Kodi v18 test builds for Vero 4K.