Yeah, sure, Open your Blockland0002 folder or w/e. Now go to RTB/server/scripts, now open player.cs with notepad. Then Edit the following lines accordingly the higher it is the faster the guy moves. Then save.
maxForwardCrouchSpeed = 3;
maxBackwardCrouchSpeed = 2;
maxSideCrouchSpeed = 2;
maxForwardProneSpeed = 4;
maxBackwardProneSpeed = 3;
maxSideProneSpeed = 3;
maxForwardWalkSpeed = 7;
maxBackwardWalkSpeed = 6;
maxSideWalkSpeed = 6;
maxUnderwaterForwardSpeed = 8.4;
maxUnderwaterBackwardSpeed = 7.8;
maxUnderwaterSideSpeed = 7.8;
Set them to about 750, if that doesn't crash your bl game, go as far as you can if you want, just make sure it doesn't crash your BL.