I understand what you're saying. It's annoying because, while it's easy to simply modify your pictures, hardly anyone ever does. Unfortunately even adding those tags wouldn't solve this because those same people wouldn't use the tags.
I've been BEGGING Invision to make this a standard feature in IPB for years now (literally) but for some reason it's still not a feature. There are plenty of hacks to do this but, as appleguru said, X-S has a strict policy of not using any hacks or modifications for ease of upgrade and security purposes.