Complicated question to say the least.
I dint think that an entire training day has to be dedicated to speed work. I think if you can handle the work load (sounds like you can if you are already hitting those movements 2 times a week) then I would add some it. It has great benefits, and you will enjoy it. I can not handle the work load from it, it often causes injuries for me. What I do is often drop sets with little to no gear (I lift equipped) and work on it there. I also tend to over exaggerate the speed on movements during warm ups as well. I have found these things work well for me.