[Dovecot] Anyone know or have a perl, c/c++ script?

Hello all, Im hoping maybe someone on this list has already looked for or built something similiar.

Basically from what I can tell, phps imap libraries or whatever dont support setting custom keywords. So I am wondering if someone has a library or script that can take a username, domain, password, folder, uid and flag to set so that my webmail app can call this to set imap keywords.

So far my google searching isnt turning up anything, but searching for the word keyword doesnt really help.