I do not spawnrape. Reasons are because I understand that it can be very annoying and it's a cheap way to get kills. No satisfaction for me anymore. I admit I used to do it quite a while ago when I was still a nub. I actually like to defend my spawn against spawnraping cav now. They will be like; noooooo my free kills.
On the other hand, there are some maps where spawns are relatively close to eachother and you can see the other team spawn. Archers on each team will shoot the enemy spawn straight away. This is also some kind of spawnraping is it not? So, I think the intention is the same on both cav and infantry, only difference is that cav can actually do it on every map, but if infantry could I think they would do the same.
Implementing a short 30-60 second training round would minimize the availability of spawnrape (first round spawnrape is the worst) because more people will spawn on time when the real rounds start and be ready.
Alas, I can not forbid my own clanmates to spawnrape. I can only advise them not to. But if they wish to spawnrape then so be it. It is not against the server rules.