Request for runtime configurable features: resolved, ipv6 disable

There are currently ways to implement both of these, but a runtime
configurable way in the connman startup for both would be nice.
A) The way to get connman to work with systemd-resolved is to
recompile with a flag:
--with-dns-backend=systemd-resolved
A setting in /etc/connman/main.conf to select either resolvconf or
systemd-resolved would be awesome.
B) Same with turning off ipv6. As it is, we can specify something in a
*.config or in the settings file in the 'service' folder:
IPv6.method=off
or by issuing:
connmanctl *service* ipv6=off
Once again, if the user is having ipv6 problems, being able to turn it
off for all interfaces in the main.conf would be nice.

Now that ipv6 is active by default in the kernel and in many other
packages, new problems appear: We have noticed that avahi will
advertise spurious un-routable ipv6 addresses and that Mozilla seems
to also have troubles when ipv4 and ipv6 are 'on' but only an ipv4
address is available.

Thanks!

Keith