[Feature Request} Exclude Boards feature for mascots

[Mabadman]

you can set mascots to only appear on certain boards which is nice
it would be cool if we had a feature to hide certain mascots from certain boards also

right now if i want a mascot to appear on all boards except /v/, for example, i would have to put in (in case someone feels like copy/pasting it):
a,b,c,d,e,f,g,gif,h,hr,k,m,o,p,r,s,t,u,vg,vm,vmg,vr,vrpg,vst,w,wg,i,ic,r9k,s4s,vip,qa,cm,hm,lgbt,3,aco,adv,an,bant,biz,cgl,ck,co,diy,fa,fit,gd,hc,his,int,jp,lit,mlp,mu,n,news,out,po,pol,pw,qst,sci,soc,sp,tg,toy,trv,tv,vp,vt,wsg,wsr,x,xs