If the steering geometry makes the bike a bit too stable, it becomes difficult to tip into bends. If you reverse steer slightly the resultant gyroscopic precession causes the bike to lean in the opposite direction - the direction you want it to go. My bike is not like that. As you approach a corner under brakes the steering is not that stable that you have to reverse steer. When I originally raced the bike, I had Ducati 450 fork yokes fitted which had a lot of offset. It gave so much trail that under brakes the bike stood up and turned the wrong way under braking. It threw me off balance. I then fitted TZ350 fork yokes which greatly reduced the trail and moved the handling away from being very stable under brakes toward self-steering coming through the corner and out under power. It means you have to learn what the bike is going to do under power, and anticipate where it is going to go. The benefit is that you turn under the guys who have more powerful bikes and get on the gas earlier, so you have the run on them. If you read Tony Foale's stuff, he mentions the self-steering effect of reducing trail too much. When I first felt it happen, I thought I'd imagined it. If you had that sort of steering on a more powerful bike, you would certainly high-side it easily.
I wouldn't even comment on this stuff on this forum except that playing with rake and trail can catch you by surprise, and the situation which can occur with too much trail can be very difficult to recover from. When I experienced it, I knew I was gone and I turned the gas on to drive the bike onto the verge to crash. As I turned the gas on again the bike came out of it's swan dive - sheer luck, not skill. Most crashes are relatively harmless - however not all. That was the nastiest near miss I've ever had. I'd had some warning - my mate had raced the bike before me, and mentioned it almost grabbed him too. I thought it was bullshit, however at least I was a little bit prepared for something like that to happen. I don't think you will get into trouble swapping commando fork yokes between models, especially if you take care the first time you ride the bike, and recognise the symptoms. If the bike is really difficult to lean when approaching corners under brakes - look out when the speeds go up ! With too much trail, the harder you brake, the more strongly the bike turns the wrong way.