Well, when you crash you\'ve to wait 30 seconds till the server readmits you. So there\'s a time when for the rest of people you\'re there, while you infact aren\'t. I personally use those 30 seconds to open the chat log and see the last lines that it has while I try to reconnect. Once in, the ones you were rp with know that you crashed, so, if something was said that needs to be known for further comprehension of the conversation it can be stated ooc or with a tell.
Personally, I don\'t see the reason of such an option, since you can open the log and search what you missed. Making a script to do so, would represent understanding the text lines, and comparing it to the desired time that you want to recover, I don\'t know if the effort is worth it.
As for the missed text, I think it can\'t be solved by code, if the packets are still UDP (and they should be like this) there\'s no point the server knows which chat text you missed or not, so, as always, the best ones to complete the missing information are the sorrounding players.
Since we all crash now and then, we must kindly help each other to don\'t miss the storyline.