Options for defensive buildings and walls

My idea is to give us more options with the buildings we already have. There are already tradeoffs for the xbow and inferno towers. Why not add some options for other towers? I naturally have some suggestions:

1. Archer towers can have a toggle where you can either have longer range with slower firing (more time to draw the bow and aim) or faster firing with less range.
2. Cannons can have a toggle between faster firing or more damage per shot so you would do more damage in total with the faster shooting but the more damage per shot may kill certain units without giving them a chance to be saved by healing, or...
3. A glass cannon idea where the cannon can do maybe 10-20% more damage but only has 1/4 of the hit points. More damage but you can't leave it exposed. Also vulnerable to lightning potentially.
4. Wall choices. Settings could include walls that can take 20% more damage before failing. Spiked walls that damage melee attackers slightly. Frozen walls that slow melee attackers that hit them for a short duration but maybe take extra damage from fire or taller walls that block hogs and jump spells. The options would unlock as you upgrade your walls and you could mix and match walls by layering them or channeling hogs into giant bombs for example.

There are of course many other possibilities but these can really make for interesting strategies and base designs without actually adding new buildings/units.

That makes sense to me.... Although it has to be balanced to carefully otherwise big walls means we will be getting kangaroos that can jump higher