Consider using Balancer's MerkleOrchard over MerkleDrop.sol

[TomAFrench]

I noticed that you're using a merkle drop contract for repeated distributions of the same token. At Balancer we've got a version of this which has been gas optimised for people claiming multiple distributions to massively reduce the number of SSTOREs needed.

The only downsides I see is that we don't support zeroing out merkle roots after the fact (expireTranche) and if you're going to be making distributions from multiple addresses then you'll need a thin wrapper contract in front to ensure each distribution goes in the same "distribution channel".

If those aren't dealbreakers though you'd benefit from being able to claim distributions more cheaply, claiming in parallel with other tokens and easy integration with Balancer UI, etc.

[fabianschu]

@TomAFrench Thanks for the initiative. What you're saying sounds very suitable to what we need. I'll look into MerkleOrchard :)