Reversers question please

When you assign thrust reversers for an add on like the Lago Tornado to a
controller switch, say a two position rocker or slide switch, I understand
that F1 (decrease throttle) and F2 (cut throttle) are used for this, but
should you use the sliders in the sim settings for these two functions or
should one or both of these functions remain a toggle (no slider)? I've
tried it several ways and am getting mixed results. It seems to function
best with a slider to the right for F1 and no slider selected in the
settings for the F2. Is this right?
Thanks much,
Dudley