Yes, cover flag with a shield (let's say, blitz alike shield), so that whoever grabs doesn't have to run out of base in an instant and can wait for team to help.
Nice map but middle is to simple.
"requiredfiles" "scripts/skplants1"
You need to add a ".txt" to that. Always check the console for errors and warnings!
You need to add like -scale 3 to the lighting stage. Be sure to test the map on the default settings. It's really difficult to see anything.