I found player filter on this site that covers all the positions in the game: Player Position Search Filter - Downloads - Football Manager 2013 Tactics, Wonderkids & Cheats
Dont know how good it is, but it is worth a look.
CREATED TO THE CREATOR FOR THE FILTERS:
[TABLE="class: cms_table_dl2stats"]
[TR]
[TD]IanC/Crusader[/TD]
[/TR]
[/TABLE]
The way I see the 4141 rock tactic is:
GK - Normal
DR/L - Full Backs (Support)
CD - Center (Defence)
DM - Anchor (Defence)
MR/L - Winger (Support or Defence)
CM - Advancing Playmaker (Support)
CF - Complete (if you have good Strikers) or Advance Forward (Attack)
But please correct me if I got the positions wrong. I just get the best out of this tactic with these type of players.
Hope it help.
Rock:
DM - deep laying playmaker
CM - box to box midfielder
CF - complete striker (or poacher)