The one in 13 definitely is possible without super object throw. Don't know about 12, never really tried that.
You just need to practice and move your mouse really quickly. It's not really hard, but you don't really need to cube throw. In 00 it doesn't save a lot of time, same in 09, same 13 :/ so don't do it
in chamber 12 : Don't do it. I do it but it's really hard, you need a LOTS of practice. And it save only 3 sec.. you have to move your mouse really quickly.
It was recently discovered that it is possible to set your mouse sensitivity to a value so high that the game considers it infinite, leading to several new glitchy techniques being discovered.
The rules have now been amended to ban these new techniques in both Inbounds No SLA Legacy and Glitchless.
