[quote=Andion Isurand]
I have a character that I might be interested in playing, although filling out the free +5 LA may take me a bit. If I play, could I apply the free +5 LA stuff at a later time, and gain retroactively any skill points from an increase to intelligence as if I possessed the templates from the beginning?
[/quote]

just take the time now to fill it in
it'll be a lot less trouble than making it up later, adjusting everything you had before the free LA was used