the game would be more similar to backgammon, where when a house has two or more pieces, they can not be captured by the opponent. However, Senet can not have two pieces in the same house. So this rule applies when there are two or more adjacent pieces. One beside the other.
I think that rule would produce major blocks, in particular at the beginning of the game.
The problem with Senet is that is a very strategic game until one player is left with just one disc. Then it becomes a game of pure luck as you have no control over the last disc. I have lost (and won) a ton of games where the last disc was stuck in an endless loop between the House of Water and the House of Rebirth. And that doesn't even include the games I lost (and won) where the required exact number to go out never came (I have seen games where I just needed a 2 and didn't get it for ten or twelve turns allowing my opponent to win).
I have proposed a version of Senet (Ma'at Senet) where the goal is to bring home five or six discs only, but I don't think anything will ever come out of it.