[specialist]

"That's a really interesting idea. Hmmm, it's worth checking out. I'm really busy working on [hyper duct work over modulator], so gimme a few days to try some things. I'll get back to you, whatever I find. Thanks for speaking up!"

Always praise the suggestion. Diplomacy beats correctness in such situations.

Most often, whoever is in charge of the schedule will push back for you. Can't risk the deadline every time someone has a goofy idea.

[gardenhedge]

I feel like this is culture dependent. In my country and workplace, praising like this would uncanny.