Is there any kind of timer control that could be used with this
system?

Yes. You could use a programmable thermostat. This is a simple direct
replacement for the hall thermostat that also has a timer function.
Alternatively, install a proper programmer in the system. There isn't really
much difference between oil and gas central heating systems, except that oil
boilers take a bit longer to fire. The controls can be similar.

You will also want to check that your hot water cylinder has a thermostat on
it. If not (and I suspect not), you should upgrade the controls to include
one (as well as a timer, probably) to turn the boiler off when the hot water
doesn't need heating.

Christian.