This includes but is in no way limited to the frequency of combats.
Other than the time it takes to fly through grav wells, the frequency of battles is determined solely by the players and is in no way a fault with the game. And decreasing the amount of time it takes to get through a grav well for the next jump is in no way guaranteed to increase that frequency.
People will play how they play. Some will try to have one massive fleet that will take ages to move around the map, some will have several smaller fleets doing hit and run attacks. Some will make sure they have maxed out defenses on their choke point worlds before ever venturing out with their fleet to harass the enemy. Others will forego most defenses and focus on keeping pressure on the enemy and force him into defensive.
As is with most complaints on this issue, the problem lies with the way people choose to play, not the game limiting choices of forcing players into one path or the other.
The way it is now allows for no long term research choices unless you have the space to research far up the tree.
Which actually works out quite well, it means on smaller maps people won't be compelled to stay turtled up for ages waiting for that top tier research to complete. That would surely make games much slower. While on one hand it's a 'weird' system to limit research options based on the number of available facilities, it allows for early decisions players make to have a large impact on the game, and it prevents the games from dragging out even longer than they do already.
The game is boring, this is completely independent of how combat works.
It is, if all you do is sit around waiting for credits to build up to research something

You can get involved in combat early, and you can keep it frequent. Yes, it takes some time to set up the necessary economy to support that play style, but it's not only doable but is the case in virtually all RTS games. Yes, some have 'rush' strategies available, but so does Sins. It's not a rush-in-5-minutes type, but still a rush.