I think we need to be a little bit cautious when calling for new rules. As much as JG's crash was a terrible tragedy (as is any death) that MAY have been caused by oil, there have been crashes (and any crash on the IoM is a potential fatal as I'm sure you'll agree) not linked to oil - would you introduce new rules for every single one of them?

In 2005 we had a very bad year for deaths on the Island. "Something Must Be Done" said the powers that be, and we got the TT Course Licence, despite the fact that arguably only one of the crashes was linked to rider ability (and that could have been picked up by the vetting process for MGP applications). However the organisers still accept applications for the TT from riders who have never ridden the TT course before, the amount of practice has been cut back, there are still large sections of the course with no crash protection, and so on. Maybe the difference is addressing these would cost money instead of making it.

The point is, kneejerk legislation is all too often a bad thing, achieving little or nothing but inconveniencing many. I'm not against all bikes having oil catch trays but where do you stop? Banning 2-strokes which carry a large amount of fuel/oil mix in tanks that can split? Forcing bikes to have wadding all round the engine (because catch trays, especially at speed, don't catch much oil)? Making riders wear full body armour and neck braces? Putting a chicane in front of every fast corner?

Be careful what you ask for, because you might get it.