I have asked Jeffrey Goggin about this as well; I quote from his answer:
"The camera self-applying an unintentional swing movement has been an issue for me, as well as many other Actus owners, and I've pondered several solutions.
[...]
Initially, I started carrying a small, telescoping "snap gauge" with me and used this to reset the swing movement to a neutral position by using it to measure the gap between the front and rear standards (via the bellows mounting plates) on either side of the rear lens element.
It doesn't really matter what the actual measurement is, only that it's equal or very close to equal on both sides (which means there is no unintentional swing movement being applied, because the difference between the the measurements will be zero when the bellows mounting plates / front and rear standards are perfectly parallel to each other.)
With a careful, practiced touch, this can be determined accurately enough for my purposes merely by feel, as the drag on the snap gauge will have equal resistance when it's pulled between the two bellows mounting plates, as shown in the photo below.
To equalize the drag resistance of the snap gauge side-to-side, one merely turns the control knob for the swing movement very slightly in the appropriate direction and then checks the results with the snap gauge. In my experience, I can usually neutralize the movement within three or four adjustments, so the process doesn't take very long. And because I photograph mostly at night, without very much light around, it can even be successfully done in the dark [...]
--foto1--
Although it's a minor nuisance, this process allows me to reset the camera accurately enough (typically to within ~.005") while I'm photographing in the field in just a minute or two. When I later return home, however, I will reset it slightly more accurately using a micrometer caliper and by determining the actual measurements instead of by feel alone.
Ultimately, though, I decided that because I use the swing movement so rarely, that a better solution was to simply tighten the swing mechanism further, increasing its resistance to rotation. This is easily done by tightening clockwise the adjustment screw located on the front side of the front standard (circled in red in the photo below):
--foto2--
It is possible to tighten the screw enough to effectively disable the swing movement completely and in my experience, when it's tightened to this extent, even a five-mile walk with my camera / tripod combo over my shoulder won't cause it to move noticeably..
Because I do occasionally use the swing movement, however, I generally leave it slightly looser than that, so the control knob can still be turned, but doing so requires significantly more effort than it did with the tension as set by the Cambo factory.
As a result, I do still occasionally have an issue with unintended swing being applied if my walk is longer than, say, three miles, but as I still carry the snap gauge in my bag, it's not a big deal to reset the camera in the field when necessary. (FYI, with the tension left as set by Cambo, the swing movement would sometimes go out of adjustment within just a few hundred yards of walking, so a couple of miles represents a significant improvement.)
And although I personally don't have any problem with the tilt movement being unintentionally applied in a similar manner, if I ever do, it can be reset exactly the same way as the swing movement is, except the two measurement points will be rotated 90 degrees, so they're at the top and bottom of the bellows mounting plates instead of the sides.
So, to summarize, Yes, the design of the camera is such that the potential does exist for both the tilt and swing movements to be applied unintentionally while the camera is being used in the field -- FYI, so far, this has not been an issue for me whenever I use it at home -- and one must check the photos being taken very carefully to verify that it has not gone out of adjustment. (Although it's not seen in the above photo, I hang a 7" diagonal, external HDMI monitor off the back of the Actus (via a bracket I fabricated that attaches to the bottom of the Actus mounting rail using an Arca-compatible clamp) which makes it much easier for me to see when the camera has gone out of alignment, as well as to focus and compose my photos in the first place.)
But even when the camera's swing and/or tilt movements do go out of alignment and requires readjustment, it's not that difficult to reset them in the field within a few minutes, provided you have a snap gauge (or some other type of simple go/no-go gauge) along with you.
[...]"