firstly, I'd just like to say,
why do you have 300 titles installed? that's just hoarding, I doubt even an advanced user would have more then 100 titles, but 300 is just plain overkill. plus, a completely customized home menu? we have themes, but not menus.
but to answer your question, no we don't yet, but they can be booted directly from most title managers like fbi, NASA, or the like without having to uninstall anything.
PS: not saying this to be mean, it's just, really? 300? I'm not saying it's a bad thing, I not gonna care if you have 20000 installed, it's your 3ds, not mine so it doesn't bother too much, it's more just plain surprise