As you linked to the Canadian government site, I'm going to assume you're in Canada. I can tell you from my personal experience that getting a government grant for a disability will not and can not affect your career after school. Unless you tell them you got that grant an employer has no way of knowing how you funded your education.
I have multiple learning disabilities and received OSAP grants for this as well as various government grants to help me finish school. I have never gone without a job since graduating.
From the RSI front, I have just been diagnosed with a RSI in my arm. I informed the HR department at my work, and my work space was accommodated to help me work.
If worse comes to worse in the future, you might need to buy your own keyboard/mouse to use at work. You might even be able to expense if you let the company that hired you know.
Hope that helps.