In the spreadsheet conditional formatting dialog's rules sub-dialog, when editing a particular "Formula is" rule, it would be extremely convenient to be able to see a syntax helper tooltip as you type/modify the formula, just like when you type in the main Calc window's formula bar.
UX Team -- please take a look at this enhancement. Thanks!
Sounds to me as over-engineering. Sure, it is convenient but if you copy/paste not necessary. I mean you don't program formulas in the CF dialog, do you?