Please keep in mind that I for one don't want Joe Random's Own Little ISP, for example, get a sTLA. The whole point of tightly aggregated DFZ is pointless if that would be the case.
Getting IPv6 address space, subTLA-level address space, should be way more difficult than getting an IPv4 /29 delegation.
Let's not lose the meaning of sTLA; it's not (in my book at least) meant for small ISP's.
While the technical discussion is very important, please also do not loose site of the fact that it is not RIPEs role to act as a regulator. You cannot restrict a companies (or individuals) ability to carry out normal business because you think they are 'too small'. Be careful with what a policy says or a nice committee from an EU competition commision will want to talk to you. Peter