Savage shifting with BL motor.

[bl-is-future]

I see that many people lock there transmissions in a gear. Why is this? I would like to hear it shift cause i think it is cool. but i dont want to screw anything up . I had my transmission set while it was nitro and now that i dropped a BL motor in it doesnt seem to shift. I will adjust it to shift if i hear it is okay to do so. So again what is the reasoning for locking your transmission in a gear? Can i adjust mine so it shifts with out hurting components?