Set S3_LCD_DIV_NUM during operation

[sharmstr]

I was reading #570 (comment) which after many hours of struggling, solved my issue with stability in AP Mode.

I only need to spin up in Access Point mode when the network ssid/password changes. When running in station mode I dont have to change the S3_LCD_DIV_NUM setting. Is there a way I can control this setting (i.e. override only in ap mode)? Or is the build option the only way.

And how much does it even matter really? Setting it to 20 solved my AP issue, but I dont know what Im giving up in return. These are single 64x64 panels showing images and gifs. No video streaming.

Thank you.