Changing Term Vectors for Query

[Hannes Lohr]

Hello,
for some Queries i need to calcuate the score mostly like the normal score, but 
for some documents certain terms are assigned a Frequency given by me and the 
score should be calculated with these new term frequencies. After some 
research, it seems i have to implement a custom Query, custom Weight and Custom 
Scorer for this. I wanted to ask if I'm overlooking a simpler solution or if 
this is the way to go.
Thanks,
Marcel