I think it is necessary to explain my current situation here in general, because the context is probably important:
I am the youngest (25) employee in my company (a small IT consulting company with ~15 employees). I got a bachelor's degree in computer science and I started working in this company about 2.5 years ago as a Junior IT Consultant.
I was working for more than a year in a (pretty big) external project as a developer/programmer with no leadership responsibilities. However, because of the very big distance from my hometown to that workplace I switched to our "inhouse" software product team. This team consisted of 2 developers, one of them being the "team" lead with more experience than the other. They were both working on this project for about 2 years now. Pretty soon after I joined them, the less experienced guy left the company leaving only me and the "team leader" behind.
I was doing a pretty good job by bringing in my experiences from this big project I was before, combined with my good technical knowledge and thus received a promotion about a month ago to "IT Consultant" (no Junior anymore).
The software will start to be in production in about 2 or 3 months from now, but the development will keep going after that. It could be pretty successful since we already have a few hundred potential companies as our customers.
Now the current "team leader" has quit and in three months he will be gone. Because I got the most insight and experience in this software project now, it was obvious that I will take his place.
Since the project is probably going to grow soon, there will be about 2 or 3 new employees soon and I'm supposed to lead them within this project.
Since my responsabilities grew a lot lately, and will also in the future, I want to negotiate some further advantages (money-wise) with my boss. I'm most interested in some kind of profit participation, since this project could really become pretty successful. However I'm pretty new within this company and the team is small. Is it common for a software project leader to receive a profit participation from the sales of the product? What else could be an alternative to ask for, in exchange for taking more responsabilities?