`nav->` quick switching

[SevereOverfl0w]

It would be useful to be able to quickly switch between many nav-> inputs. I have this need when I'm switching between things which are slightly different and I want to select different data from them. Especially when I re-run my code, and rebrowse into it, my nav-> is lost unless I have copied it before hand.

A recent history dropdown might be a useful way to implement this.