When I use Sneak Time 0 to snap parameters they will always use the sneak time over the manual control time that is set in the User settings.
This does not work for sneaking Color to Home in a time of zero. Then it will still use the fade time set in settings (in my case 0.5 seconds)
I have tried the syntax
Chan list. Color Sneak 0 Home Enter
and
Chan. list Color Home Sneak 0 Enter
Both result in a fade to home values.