For Season 5, I'd like to see her un-stapled from Danny. I think the writers made a HUGE mistake in having her work and interact mainly with Danny. This did her a huge disservice, because it didn't allow her character to grow. Inconsistent writing didn't help, either.
Personally, I think she has better chemistry with Mac than she does with Danny, but that's just my Not So Humble Opinion.
I'd also like to see the D/L romance run it's course. They tried, it didn't work, Next.
I'd also, like so many people have suggested, a return to the Season 2 Lindsay. The strong, adventurous country girl who's not afraid to eat a spider, who tackles a suspect into a car, who does itriguing little experiments with evidence that cracks cases open, and who cares enough to find out more about her co-workers' personal lives and hobbies.
Little things like the experiment with the odor gel in "Dancing With the Fishes," figuring out that Mac played bass in "Stuck on You," The whole bug thing in the episode between "Stuck on You" and "Necrophilia Americana, can't remember the title, but I remember it was the Exotic Cuisine and the water gun wars epi. Little things like that made me enjoy her character, especially because she seemed to be proving that she can keep up with the boys.
From Season 3 onward, she changed or the way the writers wrote her character changed. IMO, she came across as selfish, whiney and unable to handle herself. I understand that she was having issues, but I don't think she handled it well. She then became this cardboard prop for Danny, and that didn't work, IMO. I'd like to see that changed.
I want to know more about her family. How come she related to that girl in "Stealing Home" so well (And notice, no emo fireworks, either)? Who is her Uncle Freddy? Does she have any siblings? What's her relationship with her parents like? Are they still living? I think that they can do a lot more with her character than the clicheed "I watched all my friends get murdered and now I'm a mess" thing that just IMO didn't jibe with what we'd seen in Season 2.
The thing is, there was so much potential there for her character. I don't know if it's too late or not, or wheter Anna Belknap has the skills as an actress to do it, but something needs to be changed, because honestly, as it stands now, Lindsay does nothing for me. That wasn't the case when she was first introduced.