Hello,
after my conversation with Gavin, I created this topic finally, so other users could see and also support this idea with their opinions. I think this is very common "upgrade" which can be easily made in few minutes (hours maybe? ).
So, as Subject tells, I think it would be great to place bets according to percentage amount of money, instead of fixed numbers. I hope I am not the only one here, who have some money management and use just some % of money as bet (in my case it is 20%). Now we can use Stake and Liablitiy, after this, there would be %Stake and %Liability too Gavin told me, that if this idea will be supported by other users, he will give it higher priority, so if you want it, support it!