The menu space limitation is a real problem because the menu would have to get larger and the hotkeys for the extra units would be silly. Although I think there is some room on the bottom row for another turret so we could take one turret.
Every possible unit does not exist because there would be role overlap and it would probably be boring. Units get character and a role from having a combination of many things. For example it has been said that Pyro has too many interesting things; jump, firing through units and DoT but it would not be Pyro without them.
So now to look at turrets; what would new turrets be for? What is their role? A slow beam tower would disrupt firing and movement for a single target. No turret does this but many do similar things. LLT and HLT kill single targets and Faraday has a similar disruption effect in a bit of an area. Newton messes with movement and is particularly good again planes. The current special turrets are underused so I don't think we need more.
A flame turret would deal large AoE damage in a relatively small range, this sounds a lot like Stardust.
quote: I want a scout tower that gives LOS |
This exists. Radar has 800 LOS and you can't complain about cost either.