Is it possible to edit the boat multi and create new ones? I tried to use the UOFiddler multi editor, I cant import boat multis, but there isnt any boat parts to use...

Thanks..

add the boat parts to multieditor.xml

Yeah, I got it, thanks Tomi =P

My other problem right now is: there is a sort of delay happening when I deal with boats. When the boat moves, if Im inside it, I move with him, but, if there is another player with me inside it, it looks like the player moves a while after, so he stays on the sea for a while. But in his point of view, he is moving correctly and I am delayed.

Is this because of the multi x,y update?

that is because the character is never "removed from the world" just moved and updated to nearby clients

If the boat moving was changed so the character get deleted and then moved and sent to surrounding players the movement will look correct but you can not follow any speech because the speech is removed together with the character.

After OSI removed support for PAUSE/RESTART packets from the client it has been buggy like this.... its more a client problem than a server problem, and my opinion about this is that better to have a bit jumpy movement than loosing all the speech while on a boat.