> Next, I'd like to see pre-IPO startups offer longer periods to exercise shares when you leave. 90 days being standard is way too low.

It should be at least 365 days so that you can split it between tax years.

I've still got options of a public company I need to "dispose" of, and I don't want to do it all at once.

Perhaps until the options expire (typically 10 years) would be too much to wish for, but that would be ideal.