Allow client apps to override staking's defaults

[angelorc]

I'm developing a client application and I want to override the staking module default max number of validators, the bond denom, and possibly the bonding time. Currently, I can do it only by

1. generating a genesis.json file
2. then changing the respective values.

I would like to override such variables either via API calls or via compilation flags.

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[sabau]

A better UX would be to have them as parameters at yourdapp init command?

[angelorc]

Yes, exactly as you said

[alessio]

#4537 is a proposed solution to this

[fedekunze]

this can be done using the staking parameters. closing