Is there a way to set attributes for `RVStack` which are not already listed in `RV.ini` file?

Before I write a custom mode to do this, I was wondering if the RV.ini file can also be used to set other attributes not already present like “Align Start Frames” (#RVStack.mode.alignStartFrames)? I have already tried inserting “alignStartFrames=True/False/0/1” but nothing happens. From the docs it looks like RV.ini is only for setting whatever properties are already in the “RV Preferences” dialogue window - but just want to be sure - thanks!