The Meek algorithm for counting single transferable votes (STVs) is considered, at least by some, to be the best vote counting algorithm when electing multiple people and simplicity is not important. The algorithm does not seem to be computationally too intensive.
Enabling this in SecurePoll should not be hard; the voting interface is exactly the same as the Schulze method, which is already implemented in SecurePoll. It is only the tallying mechanism that is different.
Please consider adding this to SecurePoll as an option.