Personally, I would like an extra inch to inch and a half. But, I am a Jeep guy as well. I would begin looking for essentially cutting board material as it is a very stable high density plastic that is not terribly expensive. Or maybe even Delrin. An inch won't significantly alter drive axle angles, more than that, you will put a bit more stress on the CV joints in the axle shafts. And start messing with alignment geometry that might be beyond normal adjustment parameters. One could go more extreme and use larger strut spacers and drop brackets for the control arms, but again, you will have issues with drive axle angles unless you lower the engine and transmission a bit. Still more headaches if you want to do all that. The original poster was discussing doing this to the FWD. I did that wih my old Caravan , spacers at the top of the strut, but I modified the engine mounts to rotate the engine a bit towards the back to keep from lowering the engine, but lowering the drive axles. But that also moved them rearward about an inch so they were not straight anyway. No, I have no pictures of that period of time.
An inch shouldn't be difficult, and I might just look into it. It is reasonably safe, as the Subaru crowd has been doing it for YEARS!