Silo has the following options for UV mapping:
Arrange UVs in bounds.
Scale UVs to Bounds.
Scale UVs Proportionally.
Recreate UVs > Using LSCM Unwrapping.
Between those options, you can quickly unwrap and scale the items very simply with little distortion in the map, depending on how the lines are cut of course. The fourth option I listed is something I use when the piece has issues unwrapping correctly and part is scaled wrong. But between these options, I find UV mapping rather quick.
I am not certain if Silo can straighten lines easily when UV mapping like the other page shows. Never tried to be honest.