Increasing time to modify base

Hey again!
I just want to know if there is a way to increase the time in wich it is possible to modify the own base. You know - to demolish or rotate base parts with the hammer.
Normally we have a (I believe) 10 minute time span in wich we can do that. After that, you'll need either C4, a ton of patience and tools or the help of an admin.

So I just want to know if I could increase that time on my server somehow - maybe even to forever.
(And if possible without plugins)

Thanks!

When a new building block is placed, it sets flag BaseEntity.Flags.Reserved1 to true.  That allows it to rotate.  But it also sets a timer to turn that flag off after 600 seconds.  Demolish works the same way, but on BaseEntity.Flags.Reserved2.  The 600 second amount is hard coded.  But a plugin could override all of that.