if you were to change to a different brand radio, I would recommend:
1) the brand you're most comfortable with
2) the brand most widely used at your club (for purposes of buddy boxing and general knowledge... if you're the only guy at the field with a hitec radio, then no one can offer any assistance should you need)
other than those 2, I wouldn't change. Hitec makes some great radios, no need to fix what isn't broken.
for your original question, I have looked over the manual for the laser 6... I'd highly recommend a newer radio
according to the manual, you get what you get with the flap knob, there is no servo travel adjustment or endpoint adjustment on any of the aux channels (5 or 6)