I think that barrel length on such a pistol should depend on balance. As FishDFly says, other makers have probably figured that/those things out, and that may be the reason your typical LePage has a certain, or within a certain, length range. You have the option of mocking the gun up with an extra long barrel, then cutting it down an inch at a time, until you find the perfect balance for you.
I think a full buckhorn rear sight, and silver blade front sight would be cool on such a pistol.
I'd love to have a LePage in .36", I think it would be an ideal (or maximum cool factor) small game and grouse gun, when big game hunting.