I'm looking for a way to configure this as well. Arguably, while most applications have a daily repetitive cycle, at the same time its weekly cycle is rather unique.
For example, peak hours on Mondays might be more intensive than on Fridays. Some applications handle different types of users according to specific weekdays, and failure rates vary accordingly. For some business application, weekends can be mostly a dead zone that can greatly impact the weekly average.
I fear that cutting off the baseline window at exactly 7 days may cause DynaTrace to miscalculate anomalies, comparing wildly varying averages between Mon through Sun.
This scenario is exacly my case, and I'd like to see a configuation to allow a wider baseline window.