I fixed it to be:

on *:dialog:mp3player:sclick:3: {
  pause
}
alias pause {
  .splay pause
  .did -ra mp3player 6 - Paused - $sound($read($($+(\",$scriptdir,mp3playlist.play,\")),$did(mp3player,30).sel)).title
  .set %mp3.paused $did(mp3player,30).sel
  .timermp3time -p
}

and...:

on *:dialog:mp3player:sclick:1: {
  if ( %mp3.paused == $did(mp3player,30).sel ) {
    .splay resume
    .timermp3time -r
    .did -ar mp3player 6 - Playing - $sound($read($($+(\",$scriptdir,mp3playlist.play,\")),$did(mp3player,30).sel)).title
  }
  if ( %mp3.paused != $did(mp3player,30).sel ) {
    .timermp3time off
    .unset %mp3.currenttime
    mp3play
  }
}

Doing this, when it\'s paused and you click \'Play\', it will actually resume and not restart the song...