I already made it wider than original but the tag-field will not get bigger.
I drive mostly the New Actros with the big sun-shield and I have enough space to place the player list really wide but if I do this only the name-field get wider.
Just to show you what I mean attached a screenshot (with my 27" full HD monitor at the side, play monitor is a 34" WQHD).
The green marked area will get wider if I change the size of the list. The red marked not and after 14 or 15 characters (of 19) the tag is truncated.