Is it possible to strafe/sidestep?

Is it possible to sidetep or strafe in Heretic? Currently I'm playing using Cursors, ctrl and space.

I'm struggling to avoid enemy projectiles without the use of a strafe. I've avoided using the mouse as it feels strange to not have free look.

I don't see anything for this in the options. Will I need to modify my config files or similar to enable this functionality?