The first might be a libinput issue (I believe it's new within the last year or so): After typing, two-finger scrolling does not work until a delay of what seems to be a full second or more has passed. It's not a movement threshold issue, since wild movements don't fix the issue, nor is this delay experienced without first typing.
Note that moving the pointer and clicking with the touchpad work immediately after typing. Only two-finger scrolling seems to be delayed.
The second issue is that the touchpad does not function whatsoever during installation. Using the graphical installer, I have to rely entirely on the keyboard to navigate.
Output of lspci:
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00:00.0 Host bridge: Intel Corporation Haswell-ULT DRAM Controller (rev 09)
Subsystem: Dell Haswell-ULT DRAM Controller
Kernel driver in use: hsw_uncore
00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT Integrated Graphics Controller (rev 09)
Subsystem: Dell Haswell-ULT Integrated Graphics Controller
Kernel driver in use: i915
Kernel modules: i915
00:03.0 Audio device: Intel Corporation Haswell-ULT HD Audio Controller (rev 09)
Subsystem: Dell Haswell-ULT HD Audio Controller
Kernel driver in use: snd_hda_intel
Kernel modules: snd_hda_intel
00:14.0 USB controller: Intel Corporation 8 Series USB xHCI HC (rev 04)
Subsystem: Dell 8 Series USB xHCI HC
Kernel driver in use: xhci_hcd
Kernel modules: xhci_pci
00:16.0 Communication controller: Intel Corporation 8 Series HECI #0 (rev 04)
Subsystem: Dell 8 Series HECI
Kernel driver in use: mei_me
Kernel modules: mei_me
00:1b.0 Audio device: Intel Corporation 8 Series HD Audio Controller (rev 04)
Subsystem: Dell 8 Series HD Audio Controller
Kernel driver in use: snd_hda_intel
Kernel modules: snd_hda_intel
00:1c.0 PCI bridge: Intel Corporation 8 Series PCI Express Root Port 3 (rev e4)
Kernel driver in use: pcieport
Kernel modules: shpchp
00:1c.3 PCI bridge: Intel Corporation 8 Series PCI Express Root Port 4 (rev e4)
Kernel driver in use: pcieport
Kernel modules: shpchp
00:1d.0 USB controller: Intel Corporation 8 Series USB EHCI #1 (rev 04)
Subsystem: Dell 8 Series USB EHCI
Kernel driver in use: ehci-pci
Kernel modules: ehci_pci
00:1f.0 ISA bridge: Intel Corporation 8 Series LPC Controller (rev 04)
Subsystem: Dell 8 Series LPC Controller
Kernel driver in use: lpc_ich
Kernel modules: lpc_ich
00:1f.2 SATA controller: Intel Corporation 8 Series SATA Controller 1 [AHCI mode] (rev 04)
Subsystem: Dell 8 Series SATA Controller 1 [AHCI mode]
Kernel driver in use: ahci
Kernel modules: ahci
00:1f.3 SMBus: Intel Corporation 8 Series SMBus Controller (rev 04)
Subsystem: Dell 8 Series SMBus Controller
Kernel modules: i2c_i801
01:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8101E/RTL8102E PCI Express Fast Ethernet controller (rev 07)
Subsystem: Dell RTL8101/2/6E PCI Express Fast/Gigabit Ethernet controller
Kernel driver in use: r8169
Kernel modules: r8169
02:00.0 Network controller: Qualcomm Atheros QCA9565 / AR9565 Wireless Network Adapter (rev 01)
Subsystem: Dell QCA9565 / AR9565 Wireless Network Adapter
Kernel driver in use: ath9k
Kernel modules: ath9k
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I: Bus=0011 Vendor=0002 Product=0007 Version=01b1
N: Name="SynPS/2 Synaptics TouchPad"
P: Phys=isa0060/serio1/input0
S: Sysfs=/devices/platform/i8042/serio1/input/input2
U: Uniq=
H: Handlers=mouse0 event1
B: PROP=1
B: EV=b
B: KEY=e520 30000 0 0 0 0
B: ABS=660800011000003
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[ 58.597] (**) SynPS/2 Synaptics TouchPad: Applying InputClass "evdev touchpad catchall"
[ 58.597] (**) SynPS/2 Synaptics TouchPad: Applying InputClass "touchpad catchall"
[ 58.640] (--) synaptics: SynPS/2 Synaptics TouchPad: touchpad found
[ 58.641] (--) synaptics: SynPS/2 Synaptics TouchPad: touchpad found
[ 58.641] (**) SynPS/2 Synaptics TouchPad: Ignoring device from InputClass "touchpad ignore duplicates"
GNOME provides touchpad options such as natural scrolling and two-finger scrolling, and those settings work.