This alias will log the character you specify, e.g. -l Poromenos will load Poromenos.mcl from the \worlds directory. Easy to make, some just may not have thought about it.
<aliases>
<alias
match="^\-l[ ]+(.*?)$"
enabled="y"
regexp="y"
send_to="12"
ignore_case="y"
sequence="100"
>
<send>Open "%1.mcl"
PushCommand</send>
</alias>
</aliases>