This is certainly one I would be in favour of, as I find it sometimes takes as long to break a route up into manageable chunks as to actually create it! Could do it so that it split routes into set distance or time, or even just a simple "split it where the marker is".
That's a very good suggestion, thanks. I've added it to our Feature Requests list.
It would be helpful to have a button that allows you to split a large route into sections.
eg I recently completed a 1500 mile route. I had to laboriously split this into 100 mile chunks as a 1500mile route takes forever to load.
I recently discovered there is an online app at https://simple-gpx.herokuapp.com/ that does this so its certainly possible.