I think it will be good to have variable time limits in Spoj just like in Hackerrank or in CodeChef(http://blog.codechef.com/2009/04/01/announcing-time-limits-based-on-programming-language/).
Common TL for all languages makes a problem either tough with slow languages or very easy with fast languages(I think this applies for many problems in Spoj).
There are many problems that are unsolvable with Python but gets AC with C/C++ bruteforce.
So, introduce variable TL please! 