Generally, how to you consider such requests? Obviously, on a large airport, you can more then easily take-off from the various runway holding points, even beyond half-way. It is however, while you’re already taxiing, ultimately guesswork, because you’re not going to perform a proper take-off distance calculation before responding.
If the distance is not signed — I thought it was at Cologne, but I can’t recall for sure, even though I last used it yesterday evening — then the tower/ground controller should be able to give you the TODA from the intersection. If not, it’s specified on the DFS Aerodrome chart.
Since I’m more than happy to take the 1863 m 32L it would seem churlish to refuse the 1840 m on 32R from A3. They normally give me A2.
As long as I’m flying a Cub, no problem. If it’s into wind, anyway.
