Not something I agree with when you consider that some people would be able to continue taking part in a sport with an aid that otherwise would be unable to do so. If the arguement you present is to hold up then they should not allow release aids for any discipline.
If there were provisos for all possible outcomes then the rule book would be a lot thicker than it is. As Blakey said, you can use a release aid but you'll count as a
compound. AGB also follows BLBS for most of it's rules regarding longbows so that AGB can attend BLBS shoots with the same bow, and BLBS can attend AGB shoots for traditional shoots.
There is nothing stopping you using a release aid at club level, but in theory you will not class for any classifications/club records etc.
I was not aware that sight marks were allowed.. that is good to hear...
Rubber bands/ground markers/marks on bows are common amongst
longbow archers (for target), personally I view them as cheating which is why I don't use them. You can even have a bow sling but I've yet to see any
longbow archer use this.
Tennis cricket etc are team sports and one expects similar kit or uniforms to be worn when in competition. Archery whilst it may be in inter-something competition/event/whatever.. remains essentially an individual activity and I really can not be convinced to see a need for dress codes other than please someone else's concept of what is to them aesthetically acceptable..
I'll agree cricket is a team sport, but tennis is individual unless you play doubles. The only difference is you always need an opponent, as the dress rules only really apply to competitions then a dress regulation seems fitting. You see most (at target at least) wearing club kit anyway.
Flamez mentioned that and I have read, only today, about that perticular difficulty arising and that if the preference of how one holds the string is already chosen it an be taken into account when the bow is being tillered. As regards anyone else attempting to impose practices of their choosing and excluding those I would choose to adopt then sorry I am not going to allow people with that sort of arrogant sense of self importance to do that to me. It would not be as though I was doing something that would give me an unfair advantage that other people would be excluded from adopting if they so wished.
In regards to longbows though, I've just had a quick scan of the rules and where you have your fingers on the string isn't mentioned (forgive me if I missed it during my quick scan, if I have please point me to it).