personally I think there are more benefits to honey than there are risks. Honey has been used in glider diets for years and I don't believe I've ever seen one report of any serious issue with it, I think it comes down to personal opinions...
I know that Diane Robertson- the creator of the highlands diet, is opposed to any honey being used, even just for snacks. But, personally I believe her diet is lacking necessary vitamins and minerals ( calcium for one ) and has a lot of unnecessary ingredients like oils in it. She has drastically changed that diet a few times and has not had a study done as of yet. She says she has plans for a nutritionist from Busch Gardens to look at it, "when they can squeeze her in". The thing is if she's making drastic changes the diet is not really nailed down yet and until it is I don't think it should be a public recipe, there are many people feeding different variations of it from her previous versions.
Diets say to follow exactly because altering it in any way changes the ratio's that have already been balanced and adding or removing things can make changes on how vitamins and minerals work together. Some things are in a recipe for a specific reason, like vitamin k, vitamin k helps to flush unused stuff out of the body with normal waste instead of storing that unused stuff in the liver or kidneys. If you remove the ingredient that has the vit k your changing a pretty big thing. So if a diet calls for chicken baby food use chicken baby food if it calls for shredded chicken breast use the shredded chicken breast... it's designed this way for a reason.
If you have questions like this about a specific diet the best thing to do is go to the creator of the diet and ask them. I spoke to Bourbon Hackworth for at least 3 hours yesterday on the phone, she is the creator of BML. I learned more from her in those 3 hours than I could have in months of reading.
As far as I know everyone that has created a diet is willing to answer questions about their diet and they are the ones who should be answering those questions. They want people to understand the diet they chose to feed and are really approachable and open to questions.
Lastly, there is no "best" diet, the best diet is what ever one your glider eats well. Once you have a diet plan, and determine if they will eat it well then stick with it until they don't eat it well. But give it a good chance, sometimes it takes a few days for the gliders to accept a new diet.