lol I really like the idea of converting all niggles to bonehead... that'd mean half our league would stand around doing nothing!
I can't say I'm a big fan for increasing the number of boneheads in the game. For one it increases the chances of people "forgetting" and it means more dice rolling.
Actually I'd like to see more -Av - as this has the effect of decreasing the player's on pitch reliability and increasing the chances of them getting injured/killed normally
It may mechanically work ok, but it has some severe deficiencies in background logic.
A niggling injury is one that never quite heals properly, or perhaps one that recurs easily in training. Back injuries being good examples. It does not affect a persons mobility most of the time, but every now and then immobilises them in agony. The sort of thing that you could foresee happening regularly in a high impact 'sport' like BB.
I think that the injury table as it stands works just fine, and that there is no need to change it.
What about this - ageing only does the following. EVERY time you gain a skill, inc. the first one, you roll for ageing using the existing table. If you age, then before every game you roll a D6 and on a 6 you miss the match. The next ageing result increases this to 5 & 6 and so on until the only way they play is on a 1.
This way you can have an injury table that reduces on field stats, and an ageing system that lowers a players chance of not playing at all cos of creaky bones