Please remove the restriction that makes it impossible to make the offsetted element longer than the base element. It is normally the direction that is important and the length can be edited afterwards. Otherwise add an opportunity to remove the restriction of the length when one of the offset tools are used. If the base element needs to be shortened or trimmed it can cause a lot of trouble.

As it works now, when you select "Remove offset rule" you get a doublet geometry which also causes problem and when you remove the doublet, the remaining geometry has offset rules anyway - this causes problem so personally I don´t use that much even though I would like to.