Toolbar customisation

The toolbar customisation capability seems pretty inadequate to me.

For example I’d like to insert a couple of DIVIDERS to space out the few icons available. I’d also like to be able to use some of the right click format options as icone - e.g. strikethrough and superscript.

Why is it so limited? It is 2016 after all, not 1985. 

I have seen posts dating back 2+ years asking for this and as far as I can tell the request is being ignored, or am I missing something?