What model LCD do you have? I have a newer Panasonic DLP. (the 56dlx25) and I noticed it uses the same codes as my previous Panasonic crt-rptv ( 3 year old 53wx42 I believe)

With the dlp there's no direct selection either, it's done sequentially. The only way I can see to do it, is to make a macro... Hit the 'input' then whatever number corresponds to the input you need.