Why should mIRC handle the arbitrary implementation of some random script? DCC transfers have no inherent link to any pack number. If you want to decide on the rules for linking the two, you should write a script to do so.
DCC transfers are directly linked only with sender nickname and ip/port, and file name and size.
however you can retrieve the seconds elapsed since transfer started with $get(1).secs - even though this is not an essential information, and even though this also can be easily scripted with a /timer command
