Absolutely brilliant: stretch goal - button integration to skip forth and back

[dupreesi]

great job!!! really amazing idea and realisation. code really well structured. One idea would be to insert two buttons to skip through the line object. just because on mobile its often a pretty cool feature and a good user experience instead of dropdown menus.
like so...

but really amazing overall

[sbinlondon]

That's a really cool idea! Thanks @dupreesi