Oh, I'd also add a first-person thing. I wanted to look around at the areas but the fixed camera wouldn't let you.
UUUUGGGHHHH, YEEEESSSSSS. So many times my first playthrough did I want to just gaze at all the textures. The game is PRETTY and I always lamented (hence the title?) that there was no first-person view mode.
Apart from making the level design more interesting and also adding more platforming sections (ones that actually worked, 'cos the platforming is even worse than in
CV64), there's not a terrible lot I'd change about
LOI. I enjoyed it a lot when it first came out despite its shortcomings, and it gave us one kickin' soundtrack at least.
However, I'd love for there to be a 2D console game. Dot art is pretty much impossible with the higher resolutions (even pre-HD) but a hand-drawn approach would have been cool, granted the animations were actually good and didn't explicitly look like Flash.
Castlevania was always made to be a console series with lavish graphics and music, and the GBA/DS didn't do the series justice, in my opinion. (For that matter,
Dracula X Chronicles should've been a PS2 title.)