I use a version to the T-6 stuff form time to time.
As well as the old Tweaker, WinTuner, and GMEPro.
And from time to time raw editing of the .bin file.
Tweaker is no longer sold, Wintuner is freeware that you'll have to hunt for, and I'm not sure if GMEPro is still for sale.
Each has their own advantages and disadvantages.
Wintuner, and GMEPro will run on just about any machine with DOS on them, where as with the others you need Windows.
No one editor that I know of has all the tables switches and settings in it, so there are times you might refer to the hex version of editing things.
There's LOTS of stuff to learn and play with in the chip.