Firstly, a 50k loan falls below the min amount of 100k. As for 2 loan amount being bundled together to enjoy lower rates, it is possible as there are often room for negotiations. As such, if you have a big loan quantum you can be sure that there will be a better deal for you.
5 years min ya. Based on 5 years and a 100k loan, there will be more than $2000 in savings when converting from a package of 2% to a package of 1%. So if you ask me, though it might be a small sum to many, I say yes, $2000 is money afterall.