Very Interesting question...
Firstly I think this question is valid from End User point of view.
The options available here can be:
1. To Block the individual condition records for the condition type or
change their validity period. (Quiet cumbersome.. and maybe non
feasible)
2. To Use condition exclusion. But I m not sure that it would work in
this case.
3. Block the condition Type.. Will have to find out how this can be
done.
Lets ask Mr. Prakash tomorrow and then discuss.
Regards,
HItesh