Personally, I have flown every hour in my logs. I see no point to make it up. You can't fake enough time to really matter, and if you did, it would be obvious to someone with more time that you do not know as much about flying as your time would indicate.
In other words, you might be able to fake 5%, but is that 5% worth risking your entire career for? If you pad the books 30%, that will be easy to detect by most employers.
Besides, 20 years from now when you have thousands of hours, you won't be able to look back with pride and know that your books are accurate.
I take great pride in my flying and in my records, I think it is a crying shame that some people have so little honor. Personally, I think padding logbooks should result in your certificates being pulled.
Jason