I'm scared of accidentally putting it into reverse while using the clutch. I'll get it one day tho. :)

arent most 5 speeds syncronised the spicer 5's like in the international 4700 series dump trucks even u power shift them you'll wear out the syncronizers and tear up the tranny those 5 speed dumptrucks are a joke they have no torque what so ever I remember the dt466e truck I drove with a 5 with a full load of sand it was hard to get the truck rolling

Even using the clutch, while going forward, it will not go into reverse. I've seen guys at racetracks when doing the 3-4 shift, tap the reverse lockout...the back up lights come on, but it wil not go into reverse. You have nothing to worry about, and are paranoid.