You can also press the \"r\" key so you will automaticly walk, than you can talk too while you\'re walking.
What you mean with piggypack.. I dunno but it would be a good idea to click on humans or animals to follow them, that he/she will just walk to that player and when he/she walks you will walk with him/her.
Yes..your walking idea could be usefull but I think the admins have lots of more things they want to do with the mouse. Than it would be nessasery to let a box show up when you click somewere so you can choose about \"pick up, walk, run, \"etc.