I would like to be able to highlight transactions in different colors. This would enable me to find different transactions that I'm having issues with. An example would be checks written but not cashed so I can follow-up with payees. 10 colors should be sufficient. Kind of like working in Excel highlighting a row.
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As Quicken captures daily transactions sometimes there are needs and offset in regular activity that you want to hightlight in the ledger. Maybe a unexpected service cost, etc. I would suggest a right click option that could bold or change the text to red (example) that you could look back later as identify a changed happened. Same request for the account list on the left. The ability to change the color of the account name would offer great organization at a quick glance. In the now, everything is in Blue.
[Edited - Merged Similar Ideas]