They could easily fix this..they just don't seem interested because it's not a feature they use. I've even found canned packages they could drop in that would make compose work.
http://software.freshmeat.net/projects/wapsendmail/
about
:
@1 WAP Sendmail lets your visitors send emails to any email address from your WAP site. The script checks the validity of the email addresses, and other required fields. The WAP input form is included.
Sample implementation:
wap4.com (you can use this site to compose manually by adding to your bookmarks)