save settings when export / color mode shortcut?

This question is a two-parter

i work primarily in CMYK but when I need to send through whatsapp or email a proof, I need to change to RGB so it can be read correctly

I have a few options that i employ.

1. snipping tool screen shot - quick and dirty. not so clear

2. export for web - slow and sometimes crashes if size is too big.

3.  export - fast, options can't be selected unless it shows a dialog box as export for web.

now when I export for web the settings save. But when I export the settings never save and the color defaults to document color mode. i want to either a) save settings of export or set as default however the case may be or b) find a shortcut for changing the document color-mode to RGB/CMYK instead of changing it in layout options/general.