Writeback for Power Pivot /SSAS Tabular models

Please do this! Tabular is awesome... but is it really missing writeback??!

that will be a great addition to the SSAS tabular model capabilities

with splashing functionality for i.e. budgeting planning

You can do Tabular Write-back with this Excel add-in: http://poweronbi.com/power-planner/

If done right, writeback can add a lot of value to tabular models esp. for planning scenarios.

There is a lot of buzz in the marketplace about planning on PBI.