The parking brake light on my L3830 works just fine, provided I actually look at the dash before I drop the clutch, put her in gear, and ease it out. I have forgot to look at the dash several times.
Funny thing is, on my standard shift truck, I ALWAYS use the parking brake and NEVER forget to release it.
I guess with more seat time, I'll get in the habit of reaching down to release it whether it's engaged or not.