Cash vs. Credit Card spending

Using different tags for purchases with Visa and Amex is easy. So, I'd like to have an overview on what I've spent on Visa and what on Amex. Problem is that Visa get its founds from my account on the 5th and Amex on the 25th.

Would it be possible to add some rules/behavior to Tags. For example:
Visa = {SUM all expenses for 1 month starting on 5th AND subtract from current account on 7th}

Just an idea that would make a great product even greater!
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