Hi there!
I ask the help in realisation of such scheme:
http://img710.imageshack.us/img710/2828/mikrotikeng.jpg
1) Loading on interfaces ether1 and ether2 was half-and-half
2) BGP Multihop and a choice of the best way for Users with white IP-addresses + for Users behind NAT (if such it is possible)
Business urgent, is not enough time on experiments, and i don't want to make troubles for our clients. Therefore I ask the help