My fault, I thought you were trying to do something else. Sorry.
The place file itself controls what is displayed and how. You need to adjust each file accordingly. The cities file you are trying to use in my experience has way too many things in it unless you are zoomed in to almost street level. I would try weeding out the smaller cities in the file so it doesn't look so cluttered. As for the font, colors, marks, etc for the major cities place file, you just need to adjust the settings on the text file itself, just like you did the color earlier.
Font: 1, 11, 1, "Courier New"
; Major Cities by Population (200000 or more)
Color: 0 255 255
Text: 35.4675,-97.51611,1,Oklahoma City
Text: 39.09972,-94.57833,1,Kansas City
Text: 38.62722,-90.19778,1,Saint Louis
Text: 41.60056,-93.60889,1,Des Moines
Text: 34.74639,-92.28944,1,Little Rock
That is just the begining of the file you are using. If I turn that on in my manage places folder at no zoom it covers the whole screen. That is because of the threshold being set to 999 which is displaying everything all the time. Lowering the number will make it so that you have to be more zoomed in for them to show. What I did was make 4 different cities files with different cities at different thresholds. Put the major ones at 999, the next smaller ones at say 750, etc. When you zoom in the smaller ones will appear little by little and also be spaced farther apart. I also went through the file and weeded out one's that were not in my immediate area so they wouldn't clutter the screen.