Modding Fundraiser Plugin - Likes Instead of Money

I currently am developing a social site for a client and one of the features he requested is a "crowdsourcing" capability where users can post a goal and instead of money they will get "likes" from other community members.

I've installed the Fundraising plugin from WPMU and while I know it isn't intended to serve this purpose, as I'm interested in breaking into plugin development I wanted to ask if this task might be doable with some minor tweaks to the Fundraising plugin code.

Additionally any tips on plugin development is greatly appreciated.

Currently I'm very familiar with Wordpress in general as I have built many sites with it, and I know my way around PHP, but to date most of my work has been using pre-made plugins.

Thanks in advance for any assistance,