Can I have my upload size increased?

I want to have my max_upload size in php.ini file changed so that I can upload files up to 50 MB size

How to upload files to the server
I'd like to let users upload files 10-20mb in size to the server.

php.ini
Is it permissble to change some of the parameters in the php.ini file such as uploat_tmp_dir?

Upload file size limit
I'm using Drupal and I can't upload files larger than 2MB. Is that a php limit? Where shall I look?

php.ini?
Is it possible to have my own custom php.ini file.

PHP.INI question
Ok, I installed the gallery2 software on my website but I'm having problems uploading large files to it.

PHP as FastCGI?
I've not found anything about this in the KB or wiki so I'm guessing it's not possible, but...

Gallery2 problem
My thumbnails and images are not showing up in gallery2. I looked up the problem in their FAQ and found the solution.

.htaccess and php.ini problem
Neither my custom rules in an .htaccess or php.ini file seem to be taking affect.

PHP Question
I've just moved a web site to dreamhost that I was developing on a home apache web server.

Dissapointed so far...
Wow. I read sooooo many good reviews about dreamhost that I was quite excited about it, however my enthausuam is...