The option is already there. "View New Content" has two modes, the default is to fetch active topics posted in since your last visit (as per 2.3.x) OR based on the topic marking system (as per 3.0.0). The option to switch that is in your "My Settings" > Settings tab > General Settings.
The only difference from the earlier version is that you do not have to option to show ONLY past "week/s" or "month/s" active topics, instead it will lists all active topics from either your last visit (default) OR all content that you have not read (if you changed in Settings). The topics will be listed based on the date, so if you just need to go through the active topics in the last week then check the date and read the topics since the last week and ignore the ones listed after that.
This "New feature" has made the life complicated.
Here is - how:
1. "View New Content" on each page at upper right corner :
As explained in earlier posts in the same thread, if we go by the default search setting - "Show me all new content since my last visit", then we are not able to get yesterday's post or for that matter this weeks posts.
2. If we want to see post of last 24 hours, we need to navigate to index page, scroll down to bottom and click on "Today's active content" which is above the Board Statistics.
3. Since both of the above processes are on different locations, cumbersome and neither of them offer the options that we had in the earlier version (eg. Today, this week, past 2 weeks, this month ...), I tried your suggested option. I changed the default search setting to - "Show me all content that I have not read"
So has the life improved ? No. Here is how:
3A. Clciking on "View new content" now showing all the posts but the visited ones. Lets click on one - for example "The All New Rimweb!". After reading into the thread if you once again click on "view New Content", the thread disappears. Reason ? Because now "View New Content" shows only the new threads which you have not visited !
3B. So, if after reading 3,4 threads if you want to post something in one of the visited thread, you need to search the thread from home page. or you need to keep "Your options" page open and keep changing the Search settings. so that it can show you the earlier thread !
I think all our members must be facing this issue.
Is this new look woth this excercise ?