From my experience, the default display sort order for Community Ideas (Show All) seems to be by highest score first. My preference would be a default of "Sort by latest activity: newest first".
This way, new ideas would at least get "a look in" on initial entry. Obviously ideas with a lot of activity would also still be prominent.
I would suggest, sort by score is more relevant for Lifesize staff themselves rather than end users logging & discussing their ideas?