the commands should still be there.. are you sure using the correct version?
Namecoin version 0.3.62
Copyright © 2009-2013 The Bitcoin and Namecoin developers
help
backupwallet
buildmerkletree
createrawtransaction [{"txid":txid,"vout":n},...] {address:amount,...}
decoderawtransaction
deletetransaction
dumpprivkey
encryptwallet
getaccount
getaccountaddress
getaddressesbyaccount
getauxblock [
getbalance [account] [minconf=1]
getblockbycount height
getblockbyhash hash
getblockcount
getblocknumber
getconnectioncount
getdifficulty
getgenerate
gethashespersec
getinfo
getmemorypool [data]
getnewaddress [account]
getrawtransaction
getreceivedbyaccount
getreceivedbyaddress
gettransaction
getwork [data]
getworkaux
help [command]
importaddress
importprivkey
listaccounts [minconf=1]
listaddressgroupings
listreceivedbyaccount [minconf=1] [includeempty=false]
listreceivedbyaddress [minconf=1] [includeempty=false]
listtransactions [account] [count=10] [from=0]
listunspent [minconf=1] [maxconf=9999999] ["address",...]
move
name_clean
name_debug
name_debug1
name_filter [regexp] [maxage=36000] [from=0] [nb=0] [stat]
name_firstupdate
name_history
name_list [
name_new
name_scan [
name_show
name_update
sendfrom
sendmany
sendrawtransaction
sendtoaddress
sendtoname
setaccount
setgenerate
setmininput
settxfee
signmessage
signrawtransaction
stop
validateaddress
verifymessage
that's all
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walletpassphrase
Error: running with an unencrypted wallet, but walletpassphrase was called. (code -15)
It seems that the command is there only help is not listing it.