ok there seems to be 2 problems here as far as i can tell.
The 1st one is people using a variety of weapons - there are only a select group that go to +7 for example , like the chanters rapier thing, and also the lumi smiter for example.
To solve this problem would require going through every wpn available in the game and giving it a +7 varient. However this leads to further problems the biggest one being whom or what is going to drop it ?? and as well as that the 2nd additional problem is why would you use a +7 scimitar over the +7 rapier when its quite clear the piercing wpn is the superior on this server.
Perhaps we may give the scimitar or hand axe or light flail +7 varient an adition property of somekind - nothing huge maybe a +1 save or a 1d2 damage of a hard to find resistance or something similar to encourage those whom would normally take the hammer or rapier to try the light flail or scimitar . Just some ideas.
The other thing is the + x problem and i agree there needs to be a line somwhere and thats it - i realise and see the point about the scaling system 3/5/9/13/16/20/25 etc but do we really want +8 wpns ??
My answer is for better or worse - YES! how are we to hit certain 75 - mid 80 ac builds ?? some of which , and no im not having a go at Pm's are also sneak and crit immune - not all SOME u can get a shifter monk druid kobold thing into the 80's as well
See the thing is wherever you decide to draw the + x line thing at you will create other problems along the way. It dosent seem to be too broken as it is so i cant see alot of reasons to change it really - anyways im no DM or dev and im sure you lads will do whats best as you have always done in the past so GOOD LUCK! hehehehe