Since you're currently picking up suggestions for various aspects of the skins again, I think it's time to raise skin cache issues again. Obviously none of these can be addressed for any subsequent patch of FM06, but you've got plenty of time to think about them for FM07
First, the ability to force a reload of the current skin is essential, as it was for FM05 really. This should reload from the original graphics files, rebuilding the cache if necessary, without the need to go through the current standard process. As most players will be aware the current standard process is: change graphics files, change skin to unwanted skin in preferences, change back to preferred skin, wonder where new files went, remember the damn skin cache, turn off skin cache, change back to unwanted skin, change skin again, forget to turn skin cache back on for several days until you finally realise why the game's taking 5 minutes to start. </rant>
Second, should the cache files be split into two? At present it seems to hold both skin graphics, which are obviously skin-specific, and game graphics (kits, logos etc) which are clearly common to all skins. It seems wasteful to duplicate this additional data.
Third, cache files ought to be written to the right place. SI conform to MS standards on where to put user-created files for almost everything, from savegames to tactics and shortlists, but not for cache files which are written into the installation tree. They should be written to a location which is guaranteed to be user-writable, probably "\documents and settings\all users\application data". This will become more critical for compatibility with future versions of Windows, where user access policy looks likely to be less rational than at present :p
The last two are minor points, I know, but the first one is really quite important. Please do something about it for FM07.