But that just change SHIFT to SPACE. You still need to press two keys (space+LMB) at the same time. Why not simply bind HA to SPACE? That saving you from pressing LMB at all.
Another option (by another player) is binding Strafe to Space, and HA To RMB.
Long press Space for strafing, press RMB for HA every second.
Because I use the left mouse button to move around the screen, so I need to press it anyway. It works for me. Not saying it’s the only way to do things. But it works for me, and I thought I would suggest it.
Most of the time, you move by strafing (RMB). Really don’t need LMB. Of course you still able to move with LMB.