Renice the daemon in config.scm

[swedebugia]

Hi :)

I would like to renice the daemon and all its children in config.scm.

Is there a way to do this? 
Would you agree to make it nice -19 by default?

Until now I have survived with this oneliner when builds bog it donw:

guix processes |recsel -p SessionPID,ChildProcess |awk '{ print $2}'|
sed 's/://' |xargs sudo renice -19

-- 
Cheers 
Swedebugia