Oh, I just thought of something I recently "invented"!
I do not have a Regulator, and have wanted one, but cannot afford it, and since I had been told I really didn't need one - I got creative.
I found that if I place the foot pedal of my machine so it is "jammed" against something, I don't need pay attention to it at all, and can just concentrate on my hand movements while FMQing.
I have done it a couple different ways.
1- I put the machine on a table, that had a wall beside the right side of the machine. Then I simply scooted the machine up against the foot pedal, until it went on it's own. Then to start and stop, I used the power switch that controlled the outlet I had plugged the cord into (it was attached to the table).
2-I have a pressing table, underneath the cutting table where I put my machine when I am FMQing. There is a slight gap between the pressing tabel top, and the cutting table bottom. I wedged the foot in there, and it kept going. I could then use the sewing machine off/on switch. One word of caution on this though, you don't want to wear out your machine's switch! But, you could get an extension cord with a switch on it. When I did this way, I put a mark on the foot, so I would know in the future exactly how far to press it under my table, so I will always get a consistant speed, from one time of sewing to the next. I played with it until it was fast enough but not too fast.