The use of an AT in order to "lock up funds" (in return for some interest) is an interesting concept and one that is far better than any other approach (as you don't need to trust anything other than the actual code).
At first I was mystified as to what the purpose of this AT was but having seen other offers to stop coin dumping I finally "got it" (not being a miner nor invested in the coin itself sometimes this things are not obvious to me).
The AT team will be happy to further review this new AT code and hopefully we'll have an endorsed version available soon for this new use case (as usual we won't charge for our work but any donations made via the ATDevelopment Crowdfund AT would be appreciated).
Keep going CIYAM we need more of your development for the coin!