The "Custom" tab on the "Script Functions" list that shows when using the "Script Editor" is fantastic.
Maybe I knew about this time saver before, but I had forgotten about it:
Right-click a "Script Function" from the right-hand panel
and select "Add to Custom List". Add the functions that you use most, like:
IF
IF File/Folder
Get Registry Key Value
Get Special Folder Path
Get System Info
Set Variable
Click the "Custom" tab at the bottom of the "Script Functions" list and you will get a grouped list of the functions you use most.

My only suggestions to SB would be to:
1) Place a comment in the "Script Functions" list when it is empty that reads something like:
(Right-click from Standard tab to add items to this list)
2) Consider allowing right-click on Script Variables to add to this list and then make a right-click work on dropdown variable lists, on the popup windows, to draw from this shortened list of variables.