spring trap upgrade

Hey guys,this is just a suggestion but I noticed that spring trap is the only defence that you can't actually upgrade and I was just trying to think of ideas to think of so that we could possibly upgrade them?

• One idea is that when you upgrade it, the trap increases by 1 tile making it harder to avoid
• the second idea is that when you trigger the trap it reloads its self and can be used again but, if it gets used say once, you would have to re load it to be able to be used it twice in the next raid otherwise it will only go off once
• my last idea is that when is gets triggered it flings the troops like it normally does but then it slightly damages the following troops (only if they are right behind) like a bomb would but it wouldn't do as much damage

Thanks for reading my ideas, of you think these are decent ideas or think of something different then please do reply