Clarification of "Set a new estimate" on log work page

After discussing with some of our managers, we think the wording on the "Log Work" page is a little confusing, and should be changed from "Set a new estimate" to "Set estimated time remaining".

I may log 4 hours against an 8 hour task, but now know it will take me a total of 10 hours. So at first we thought one should log 4 hours, and "Set a new estimate" to 10 hours, which is incorrect – it's actually estimated time remaining on the task, not the task estimate. Sort of a difference between the thinking of a developer and a project manager.

Additionally, might be able to combine the "Leave existing estimate" and "Set estimated time remaining" into a single field, perhaps defaulting the original value? Not sure.