LDCad 1.7 Alpha 2 (win+linux)

[N. W. Perry]

The default space bar function is to zoom the last used view when using multiple views.

But if you don't need that it's a good alternative for ins.

I have actually never used multiple views (sacrilege!), so I didn't think of that.  But I did recently discover ctrl+space for the full-window view toggle, another nice feature.