You forgot an equal sign on the !drink command for potions. Should be

if ( %magicp [ $+ [ $nick ] ] >= $4 ) {

and the same for the check for powerboost potions. Otherwise the player can't drink any potions unless they have 2, and even then they can only drink all but 1 potion.

You mean like add the information from /ns info nick to a /whois?

Normally, when you do a command like /chanserv access #channel list, you get the list of usernames and accesses sorted by time of entry into the list. This can make it difficult to see how many users of a certain access level are in your channel, and it can also make it hard to find specific records.