It bothers me that Tumblr forces you to go back to page one of your Dashboard to post stuff that’s not a reblog of what’s on that page. Why not have the post options on every page of the Dashboard? It can be on top, on the side, from a drop down menu, or whatever. After posting, it should have an option to send you back to where you were on your Dashboard before posting, to your post, or to the latest entries.
A workaround right now is to open page one on another tab and post from there but this way you’ll end up with two Dashboards, one with new entries already posted by others.
Surely this is something the designers at Tumblr have thought about but decided against. I wonder what their reason is.