hello,
thank you Blob and Sassy for your Answers.
I studied the box relay, it's possible of course but after reflexion it change radically the user process. So i don't want change the process just for a technical problem ( mostly just for the unlink ).
I studied too the llAllowInventoryDrop and found it was no really adapted but never thought to put in owner menu with timer. I find it's a very good idea andf i think i ll go on this solution.
Thank you again.
Ps : I know I didn't say what is the project but i don't like tell on that before the end. Certainly i m a few paranoid But when all ll be end ( very soon now ) I ll send to you the item if you want of course. It ll give free traffic for your shops and lands ( i hope )