Description of problem:
In an environment with Fedora 25 as host OS and guest OS, I'm unable to fine tune the key press speed and delay of the keyboard. This is quite tedious problem especially doing development inside the guest.
Version-Release number of selected component (if applicable):
spice display has a keypress-delay setting, which can be tweaked with an environment variable SPICE_KEYPRESS_DELAY. Default is 100ms. So you can try that and see if it fixes things for you. Could be that there are other problems though, google 'spice keypress delay' there's a few interesting hits
vnc display doesn't have any keypress delay/timing options though
TBH I don't see this as something we would add to virt-manager UI, which doesn't aim to exhaustively cover all display options, because there's a ton. That's something I think virt-viewer should do which aims to be the universal viewer
Per the recent design document, I think this request falls under 'advanced VNC/SPICE viewer config' and is better left to dedicated tools for that, like virt-viewer. So this will not be implemented in virt-manager, sorry.
Closing as WONTFIX