Yes, anyone can be a developer on this project(That's the purpose of open source). All you have to do is meet some basic requirements.

First, you need motivation. Next, you need a working knowledge of C++ and SVN use. Then, you need to actually write some code for the project. This code can be submitted to me via PM as a patch, or just changes via some thing like http://pastebin.com/.

After that I or another one of the current developers will review the changes and if they help in some way. I will commit them in your name. Next, I will contact you via PM and get your SourceForge UserName and add you to the the SVN with developer privileges in order for you to make future commits on you own. Lastly, after your next commit you will be listed as a developer here at the forum.

For more help getting started with C++ and areas of the software to look at first I'm posting a link to a few online tutorials and free software links here.

Turorials:
C++ Language Tutorial from cplusplus.com
C++ Made Easy: Learning to Program in C++ from Cprogramming.com

Software:(These links are for Windows users)
Visual Studio Express
TortoiseSVN GUI SVN Client for Windows (Easy to Use)
Links to Command line versions(Advanced Users)
Minimalist PSPSDK for Windows(MinPSPw)

Getting Started:
There are several tutorials on this site that can be used to help you get started setting up your developer environment. The one I recommend for developers is this one by Salvy How to Compile your OWN Daedalusx64 Alpha

After you can compile your own Alpha using the above tools then I recommend using Visual Studio Express. You can use make to compile, but I recommend VCExpress as the editor.

Finally a good area to start learning at is the BlendModes.cpp file. There are instructions in it by Salvy on how to implement blend modes.

Final Note: If you need more help I suggest asking in the Daedalus PSP Section of the forums.

Thanks for the support,
Kreationz