Over the last few years, I have gained tremendously from the collective wisdom of you all. And have also made a lot of progress on the personal finance front. And for this, I am sincerely thankful to all of you.
I am now in a peculiar situation regarding my departure from my megacorp employer.
My background:
I am fairly high on the technical ladder, and although not a manager have managed teams technically. I also have several years of tenure with my employer and I am also a recognized subject matter expert in my field in the company and the knowledge that I have about company products that I have helped develop cannot be replaced by the company without investing a lot of money and time. Management has strategic but not technical knowledge, and I was providing the technical knowledge. Company also has hundreds of customers for these high-value product, and supporting these would be next to impossible for them without the knowledge transfer from me.
My current situation:
Currently am technically leading the development of new product. This new product will also be high-value. For various reasons I had a disagreements with the management and I have now communicated to management and HR that I would like to transition out of the company while cooperating on a transition plan. I have also asked to put in place severance agreements in return for my cooperation during the transition. HR has communicated that they will respond in a few days.
I think I have a lot of leverage in this situation, primarily because employer has many contractual agreements with respect to the new product being developed, and also for supporting the existing product. And because of all the excellent advice I have received here, am in strong position to weather extended periods of unemployment, but I also think my skills will be easily transferable to another employer. And I am also residing in a economically dynamic geographical area with lots of employment opportunities in my field. My spouse will also continue working. I do not have another job lined up.
My questions are as follows.
1. Should I proactively send HR my terms for the severance agreements or should I wait to hear from them? I ask this because my project is currently stopped because I have stopped working on it. And in the interest of speeding things up, I would want to get clarity as soon as possible. in layoff situations employer has offered 2-4 weeks of pay & healthcare for each year of service. If I should send proactively, then what terms should I ask?
2. If I do not send proactively, but employer offers severance arrangement, then in this case should I ask for more? (obvious answer is yes

I am looking forward to suggestions, pointers from all of you.
p.s. forums have some topics related to negotiations during layoff situation. But did not find anything appropriate for my current predicament.
Many Thanks for reading this and providing your inputs.
duckftl