How to use the "speed" as opposed to "line per beat"?

I was digging around in some old .MOD directories and noticed that Renoise fell back to the old style of speed rather than lines per beat. I never used FT2 but I’m familiar with the speed style from using MilkyTracker and some other tracking software. I understand that this speed is a relic of the old style of Renoise and pops up because it’s just a reproduction of the old software. Is it possible to use this style manually through some kind of scripting? If so, how is it done?