Email setup: cannot change port number

Question

So I created an account here just to express my frustration with how blackberry handles email setting. My grilfriend got a blackberry just because it's free (big mistake, i should have told her to take an iphone instead). Now she wants to check her email from the device. Her school email server uses a non-standard port number (google apps email uses port number 993 for imap server). I googled and followed the trick to enter a wrong password so that I could be taken to the advanced email setting screen. However, even in that screen I only have the option to manually enter the email server (imap.google.com). There is no option to enter the port number. It looks like that option existed in the past but RIM has now assumed that every email server uses standard port number (110, 113) and totally removed that option. This is the stupidest thing I have ever seen. Why don't you let us manually enter the port number when the system fails to find the right one? All other email clients let us do that (outlook, thunderbird, and heck even iphone). This is epic fail from RIM here.

Answer 1

Thanks Xavier. You  brought me very close to the answer.
Now only one trouble is there.
I can maintain entries in the table, and it will take host and port from here.
Port is okay.
But for load balancing, sometimes my host is like this:
abc1234.xyz.com.sg
My actual host which is doing load balancing is : abc.xyz.com.sg
So if incoming URL is like this: abc1234.xyz.com.sg:100, I want it to change to abc.xyz.com.sg:200.
All seems well, but there is this line of code: '
    LOOP AT httpurlloc ASSIGNING <httpurlloc>.
    If specified, match string against (possible wildcard '*' in) table.
      CHECK application IS INITIAL OR <httpurlloc>-applicatn IS INITIAL OR application CP <httpurlloc>-applicatn.
      CHECK for_domain  IS INITIAL OR <httpurlloc>-for_domain IS INITIAL OR for_domain  CP <httpurlloc>-for_domain.
      CHECK host_header IS INITIAL OR host_header CP <httpurlloc>-host.
The last line gives host header as abc1234.xyz.com.sg. So if I maintain my host as abc.xyz.com.sg, it does not go ahead.
I cannot maintain abc1234.xyz.com.sg. Now I am stuck.
Can advise how to go about it?
Thanks in adv.