Is it feasible for the Stats Site to have links from best bowling/batting performances on the player record to the relevant scorecard?
No it isn't, because the scorecard and ladder updating process is basically leftover from v 1.0 (the only thing really, fortunately enough); it doesn't know what the match number is. It could tell you what the scorecard file is named on my PC, but I don't think you'd find that very interesting.
For example, on your page, it's currently listing your Round 2 BS match against the Crusaders at the top. To link to the scorecard it would have to 'know' that the match ID to the scorecard link is 2138, but the match ID it uses in that part of the site is 11048-B.
It's something we spent a bit of time on before, but we'd have to overhaul the whole scorecard system for little gain, so we didn't bother.
Horrigan Cup competition ID is 13. So just open up the Bannerman Shield link and change the 3 to 13. Horrigan Plate is 16.
For those who think I'm talking Swahili with that: http://www.cricsim.com/site/stats.php?season=11&comp=13 - Horrigan Cup Season 11 http://www.cricsim.com/site/stats.php?season=11&comp=16 - Horrigan Plate Season 11
And to get even more fancy: just Pumas http://www.cricsim.com/site/stats.php?season=11&comp=3&team=4 http://www.cricsim.com/site/stats.php?season=11&comp=13&team=4 http://www.cricsim.com/site/stats.php?season=11&comp=6&team=4 http://www.cricsim.com/site/stats.php?season=11&comp=16&team=4