ehh? You watched his inp...you saw the method...not sure what you are asking him. You move mouse where you saw him move it...press the decoy set button....move out of the way....done. hehe
Actually Rick, I was meaning to find out if something other than a mouse was used for movement. I'm not familiar with what other devices MAME would support. However, I'm assuming that anything that can do the duty of a mouse, can be applied as the method of analog movement in MAME. My thought being...could it be possible for a writing tablet/ pen-like device be used instead of a mouse? If that's the case, then the precise movement that was achieved in the record .inp for Reactor would be infinitely easier to perform.
Yes, I mentioned the spinning with the vortex over 5 years ago on that Reactor page. However, without the precise movement displayed in destructor's .inp, I couldn't even fathom spinning in such a controlled manner with merely a mouse. I can almost guarantee you that such movement is an impossibility on the coin-op counterpart as I've played it more times than I care to mention as well as watched players better than I!
The question regarding the setting of decoys has more to do with how he approached moving into the chamber with the invisible walls. As I mentioned on the Reactor page, I used to mark the entrance spot through either creating a smudge on the glass or even a small stick of gum to mark the spot!

I did the same when playing Reactor on MAME. destructor just seemed to be so accurate when planting the decoy with only a few exceptions. Just curious..no big deal other than wanting to know if there are other clever ideas for this part of the game.