When doing MDI, I used the heck out of it. I can tell you that for me, diluting with a pen and using it for small corrections was huge. Why should pump users be the only ones that can do a 0.10 unit dose?!
Try it and let us know!
Not sure if you have seen this, but here is one way to empty the pen and fill it with whatever you want. I like the Lilly pens and cartridges for this, but I am sure you can do the same with Novo pens.