I would wish a constantly open window where you change your wall thickness as you set your wall..
set, then modify attributes, click ok, set a new (not appropriate) wall, reopen the attributes window, redefine thickness, click ok,.. this is not really fast..
Having this attribute window open all-time and of course changing the walls as you type the values, this would speed up this first step of reading in plans..

newbie, still in phase1, reading in plans.

thanks

Lukas